CN1304811C - Measuring and instructional ruler - Google Patents
Measuring and instructional ruler Download PDFInfo
- Publication number
- CN1304811C CN1304811C CNB018235131A CN01823513A CN1304811C CN 1304811 C CN1304811 C CN 1304811C CN B018235131 A CNB018235131 A CN B018235131A CN 01823513 A CN01823513 A CN 01823513A CN 1304811 C CN1304811 C CN 1304811C
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- transparent thin
- thin plate
- substrate
- linear graduation
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Abstract
The present invention relates to a measuring and teaching appliance which comprises a basal plate and a thin plate with a transparent top, wherein the basal plate is provided with a top surface and a periphery which is limited by at least one edge; the top surface is provided with linear scales which are evenly separated; the linear scales plumb the edge, and limit non-linear standard measuring units; the thin plate with a transparent top is provided with a top surface and a periphery which is limited by at least one edge, and the top surface of the thin plate with a transparent top is provided with linear scales which are evenly separated; the linear scales plumb the long edge of the thin plate with a transparent top, and limit the fraction increment of a non-linear standard measuring unit; the transparent thin plate can be arranged on the basal plate. The fraction increment of the measuring unit is relative to the measuring unit, and consequently, the relationship between the measuring unit and the fraction increment can be showed.
Description
Technical field
The present invention relates to a kind of ruler utensil, this utensil is used for measuring distance, is used for the measurement and the mapping of linear object, is used for the neutralization of linear measurement teaching process as the instrument that concerns between described measurement unit of expression and the described standard measure of quantity mark increment.
Background technology
When with intuitive label, the mark increment notion of standard measure of quantity can be represented by abstract or mathematical method.Master scale line on the tradition ruler is difficult for being understood by child or people.Child and youth, those people that particularly have learning disorder, the very difficult mark increment of understanding traditional the above measurement unit of ruler.For example, 1/2 ", after 1/4th inches, 1/8th inches appearance because same mark can indicate for example 1/2nd inches, one inch 2/4ths, 4/8ths and 8/16ths, some people; child particularly, the relation between the indigestion mark increment mark.
And, because the color of the mark increment mark on the standard ruler is identical, concerning the learner, be difficult to distinguish these marks.Although the length of the mark increment mark on the standard ruler reduces gradually, this length is represented the size that the mark increment reduces, and a kind of multi-color cord is difficult for to learner's explanation.For example, when presenting one inch mark, the someone says that the longest line is an inch mark.Then, when presenting 1/2nd inches marks, there is the people to say that then secondly short line is 1/2nd inches marks.Next, when presenting 1/4th inches, itself begin to go wrong.If it is 1/4th inches lines that the teacher says the shortest line, the learner just begins puzzled.At this moment term " shorter " is used for a more than group echo.Serve as a teacher when proposing 1/8th and 5/16ths inch mark, it is more serious that problem becomes.
The employed education utensil of people that the U.S. Patent No. 4,614,042 of Maurer has disclosed children and had learning disorder or physiological defect.The Maurer utensil provides a kind of method of understanding inch mark simultaneously, and this method just illustrates the extension of inch mark as inch on the utensil set point.It is on the whole length of instrument and the inhomogeneous increment of flashing.And the while does not illustrate the relation between the various mark increments on the whole length of utensil yet.In addition, it does not also disclose such fact, and promptly the increment mark is represented the increment of mark at double of described standard measure of quantity.For example: 1/2nd inches marks also are 2/4ths, 4/8ths and 8/16ths inch marks.The Maurer utensil when one inch fractional part of expression, does not illustrate 12 inches fractional part simultaneously.The Maurer utensil when being used as student's teaching aid, by design, can not be general popular widespread use as measuring appliance.
Summary of the invention
The problems referred to above are taked different colours at each mark increment mark, and illustrating then separately, the top is eased mutually on time.Described standard measure of quantity and mark increment thereof can easily be distinguished.Therefore the purpose of this invention is to provide a kind of ruler, it has the functional symbol mode to help distinguish described standard measure of quantity and described mark increment thereof, thereby extensively is student and general popular the use.
Another object of the present invention provides a kind of ruler utensil, is used for measuring distance and object, and uses when drawing.
Another object of the present invention provides a kind of teaching tools, and this teaching tools is with the teaching of traditional ruler easy to use.
A further object of the invention provides a kind ofly has above-mentioned character to adapt to mapping and ruler cheaply, and it can be used in the middle of educator and people widely.
These purposes of the present invention and advantage will become more obvious from the narration of lower surface.
According to the present invention, can reach measurement and instructional ruler above-mentioned and other useful purposes and advantage and comprise:
Substrate, this substrate has end face, and the upper surface delineation has standard measure of quantity; With
At least one transparent thin board, this thin plate upper surface has the mark increment of the described standard measure of quantity of delineation;
Wherein, described transparent thin board can place on the described substrate, make the mark increment of described delineation of described standard measure of quantity and the measurement unit markers align of described delineation, to represent the relation between described measurement unit and its mark increment.
Described ruler can be used for measuring the mapping of distance, Measuring Object or the linear object of point-to-point transmission.Described substrate can use separately, and perhaps described transparent thin board can place on the described substrate, and the mark increment of described measurement unit delineation is aimed at.Make described ruler be used for measuring distance, drafting linear figure and Measuring Object described mark increment then to described measurement unit.
Described instructional ruler can be used as teaching tools, so that use the teaching of traditional ruler.Need under the situation of measuring appliance at all, as primary school, technical school, vocational school, prison, adult and ability educational program or needing ruler in any case, described ruler can be used as exemplary tool or as measuring appliance.
Description of drawings
In order to fully understand character of the present invention and purpose, the detailed description that should carry out in conjunction with the accompanying drawings with reference to lower surface, this accompanying drawing constitutes the part of instructions of the present invention, and wherein, identical Ref. No. is represented the corresponding component in institute's drawings attached:
Fig. 1 is the top plan view of the described base component embodiment of ruler of the present invention;
Fig. 2 a-2e is the top plan view of described substrate and four transparent thin boards, and described four transparent thin boards place on the substrate, make the mark increment markers align of standard measure of quantity's mark and standard measure of quantity.
Fig. 3 is that ruler of the present invention is at the exploded view that uses under Fig. 1,2b, 2c, 2d and the 2e element operation mode.
Fig. 4 is another embodiment of transparent thin board 2b described in substrate described in Fig. 1 and Fig. 2.
Fig. 5 is another selective embodiment top plan view of transparent thin board 2d described in substrate described in Fig. 1 and Fig. 2.
Fig. 6 is that ruler of the present invention uses another exploded view under the transparent thin board 2d mode of operation described in element described in Fig. 1 and Fig. 2.
Fig. 7 is the skeleton view of another embodiment of the present invention.
Embodiment
With reference to Fig. 1-6, shown in ruler utensil of the present invention comprise substrate 10 and a plurality of top lip 11,12,13,14, all flat boards all are the monolithic one-piece construction basically, substrate is by timber, cardboard, transparent or plastic opaque sheet material manufacturing, and a plurality of top lip are by transparent plastic plate manufacturing.Substrate 10 has upper surface 15, lower surface 16 and elongated rectangle perimeter respectively, and this rectangle perimeter is respectively by the straight upper and lower long edge 17 that is parallel to each other and 18 and limited by straight forward and backward minor face edge 19 and 20 respectively and form.The upper surface of described substrate is provided with the linear graduation 21 of figure notation, and this linear graduation is arranged to perpendicular to last long edge 17, and limits the segmentation zone 22 of described standard measure of quantity, and this region upper surface has the intuitive label of delineation.
In the embodiment shown, described standard measure of quantity is an inch unit.In other embodiments, described standard measure of quantity is a metric unit.
In other embodiments, the following long edge 18 of substrate 10 can be a curve shape, comprises one or more circular opens.
With reference to Fig. 2 a-2e, top lip 11,12,13,14, have upper and lower plane 23,24,25,26,27,28,29,30 respectively, its elongated rectangle perimeter is limited by straight upper and lower long edge 31,32,33,34,35,36,37,38 that is parallel to each other and straight forward and backward minor face edge 39,40,41,42,43,44,45,46 respectively and forms.
The upper surface 23 of described top lip 11 is provided with thick linear graduation 47, and this linear graduation is arranged to perpendicular to last long edge 31, and " the segmentation zone 48 of width that limits 1/2.
The upper surface 25 of described top lip 12 is provided with thick linear graduation 49, and this linear graduation is arranged to perpendicular to last long edge 33, and " the segmentation zone 50 of width that limits 1/4.
The upper surface 27 of described top lip 13 is provided with linear graduation 51, and this linear graduation is arranged to perpendicular to last long edge 35, and " the segmentation zone 52 of width that limits 1/8.
The upper surface 29 of described top lip 14 is provided with linear graduation 53, and this linear graduation is arranged to perpendicular to last long edge 37, and " the segmentation zone 54 of width that limits 1/16.
In Fig. 2 a-2e illustrated embodiment, the linear graduation 21,47,49,51,53 at upper surface 15,23,25,27,29 limits described segmentation zone 1 " (9), 1/2 " (48), 1/4 " (50), 1/8 " (52), 1/16 " (54) respectively respectively.In other embodiments, linear graduation can limit decimeter, centimetre and millimeter the segmentation zone.Linear graduation also can limit one of a plurality of 1/10th and a plurality of percentages of inch.
In another embodiment, substrate can have first standard measure of quantity that is inscribed in upper surface, and transparent thin board will have second standard measure of quantity that is inscribed in upper surface, express the relation between first and second standards measure of quantity.This embodiment can be used to express the relation between for example metering made in Great Britain (as inch) and the metric measure (as decimetre).Therefore, inch and mark inch can be converted into the metric system equivalence value.
Additional transparent thin board can be delineated the mark increment that is provided with first or second measurement unit, therefore can represent the relation between the mark increment of the mark increment of first measurement unit and second measurement unit or second measurement unit and first measurement unit.For example, can there be the additional transparent sheet of the sub-multiple unit of inch and decimetre (promptly centimetre and millimeter) that metric system and English unit and the relation between the sub-multiple unit accordingly thereof are shown with delineation.
Corresponding with described standard measure of quantity and its mark increment, described linear marker's 21,47,49,51,53 length reduces successively.Linear marker 21 length is the longest.Linear marker 47 is shorter than linear marker 21.Linear marker 49 is shorter than linear marker 47.Linear marker 51 is shorter than mark 49.Linear marker 53 is shorter than linear marker 51.
Corresponding with described standard measure of quantity and its mark increment, the length of the linear marker among other embodiment will reduce successively.
Described linear marker 21,47,49,51,53 preferably uses visibly different color.Linear marker 21 uses a kind of color, clearly is different from the color of described linear marker 47,49,51 and 53.Linear marker 47 uses another kind of color, clearly is different from the color of described linear marker 21,49,51 and 53.Linear marker 49 uses another kind of color again, clearly is different from the color of described linear marker 21,47,51 and 53.Linear marker 51 uses another kind of color again, clearly is different from the color of described linear marker 21,47,49 and 53.And linear marker 53 uses another kind of color, clearly is different from the color of described linear marker 21,47,49 and 51.
Adopt the identical thicker linear marker of length as the described linear marker on the described transparent thin board, the segmentation zone of described standard measure of quantity is inscribed in the linear marker 47,49,51,53 of described transparent thin board 11,12,13,14 with color.
In other embodiments, the described linear marker and the mark increment thereof of described measurement unit can adopt visibly different color and thickness, and clear are different from each other the described linear marker who is included in the described embodiment.
Described transparent thin board can place on the described substrate, and the mark increment of the described measurement unit of described delineation is aimed at the measurement unit of described delineation, expresses the relation between measurement unit and its mark increment.
Described substrate 10 and described substrate thin plate 11,12,13,14 can be with rivets, annular fitting piece, traditional bookbinding, heat lamination, loose-joint butt, fastener, be fixed up in conjunction with (velo binding), nylon drawstring, can reset bonding agent or any other method that two or more parts are combined fast.Described substrate 10 and described transparent thin board 11,12,13,14 can not combine.Described substrate 10 can independently use or be used in combination with various combinations with described transparent thin board 11,12,13,14.
In use, described as shown in Figure 1 substrate can and can independently use.The user places (Fig. 1 is expressed as intuitive label A, is B among Fig. 4) on the zero line mark to object, measures nearest whole standard measure of quantity then.Described transparent thin board 11 can/can place on the described substrate 10, shown in Fig. 3 and 4, so that the linear marker of the described mark linear marker on the described transparent thin board and the above standard measure of quantity of described substrate begins to aim at from zero line mark A and the zero line mark on the transparent thin board 11 on the substrate 10.The user places object on the zero line mark, measures the mark increment of nearest described standard measure of quantity.
This step can/can repeat, described transparent thin board 12,13,14 is placed on described substrate 10 and the described transparent thin board 11, as illustrated in Figures 5 and 6 up to the user.
Standard measure of quantity needs not to be linear measurement unit.For example, substrate can have been delineated standard time unit's (as hour), orthobaric volume unit's (as gallon or litre) or increment angle measurement unit.Then, one or more transparent thin boards can be delineated the sub-multiple unit (cup amount (cup), pint, quart, pottle or decilitre) or the angular measure unit of free sub-multiple unit (as half an hour, a quarter of an hour or minute), volume.
For volumetric metering, when substrate delineation had gallon, one or more transparent thin boards can have been delineated metric unit, as litre and decilitre, are how to be converted into the metric system equivalence value with the expression gallon.The additional transparent thin plate can be delineated the sub-multiple unit of gallon, express between cup amount, pint, quart and the pottle relation how, and these units be shown how be converted into the metric system equivalence value.On the other hand, substrate can have been delineated the metric system unit, and as litre, and in order to convert and to compare with English unit, the transparent thin board delineation has English unit and its sub-multiple unit, and the mark of additional transparent thin plate delineation litre is to represent the relation with respect to litre.
For angular measure, substrate can be represented the semicircle of 180 degree, preferably adopts the form of protractor, and transparent thin board is delineated its sub-multiple unit, as 1 degree and 10 degree units.A transparent thin board can be delineated radian, the relation between expression out-degree and the radian.On the other hand, substrate can be represented the semicircle of 180 degree, the delineation of this semicircle have generally on protractor, can obtain once with ten degree units, and, transparent thin board can be delineated trigonometric function as sine, cosine, tangent or the like, express as the relation between the trigonometric function of angular dimension function, thereby can determine the trigonometric function of any set angle rapidly and accurately.
For time measurement, substrate can be circular, represents the time clock face of common 12 hours figures.A transparent thin board can be delineated five minutes units, express how 12 hours figures show hour simultaneously and minute.Other transparent thin boards can be used to delineate half an hour or a quarter of an hour, express the relation of these marks.
Like this, Fig. 1 and Fig. 2 a-e also represent to delineate the ruler of volume unit.The linear graduation 21 of substrate 10 can be defined as gallon, the linear graduation 47 expression pottles of top lip 11, the linear graduation 49 expression quarts of top lip 12, the linear graduation 51 expression pints of top lip 13, and the linear graduation 35 expression cup amounts of top lip 14.On the other hand, linear graduation 51 and 53 can be delineated and be represented litre and decilitre.
Fig. 7 depicts the time clock face 110 with the circular periphery that is limited by edge 118.The surface 116 of substrate 110 is provided with linear graduation 121, and this scale is arranged to perpendicular to edge 118, and 12 commonly used marks of delineation, this mark represent simultaneously hour and minute.Top lip 111,112,113 has the circular periphery that is limited respectively by edge 132,134,136.The upper surface 122 of top lip 111 is provided with figure notation 147, and expression is corresponding to intraday each hour of each mark.The upper surface 124 of top lip 112 is provided with figure notation 149, represents the number of minutes in a hour of each mark representative.The upper surface 126 of top lip 113 is provided with linear graduation 151, and this scale is arranged to perpendicular to edge 136, and limits 1/4th hours the segmentation zone that is marked by mark mark 152.
On the other hand, can adopt the utensil of Fig. 7 to represent relation between angular measure unit and the trigonometric function.In this embodiment of the present invention, the surface 116 of substrate 110 is provided with linear graduation 121, and this scale is arranged to perpendicular to edge 118, and limits circular degree.Figure notation is equal to number of degrees value, and this number of degrees value is corresponding to each linear marker who also comprises.The upper surface 122 of thin plate 111 is provided with figure notation, and the number of degrees value of describing on the radian value of being described and the substrate surface is corresponding.The upper surface 124 of thin plate 112 is provided with figure notation, and the number of degrees value of describing on the sine value of being described and the substrate surface is corresponding.The upper surface 126 of thin plate 113 is provided with figure notation, and the number of degrees value of describing on the cosine value of being described and the substrate surface is corresponding.
This embodiment also is the useful utensil that is used for the vector calculus teaching method.Half pattern of present embodiment, from zero degree to 180 degree, in the teaching of the use of protractor and trigonometric function and protractor angular relationship of great use.
It is in the ultimate principle teaching of navigation and guiding that this embodiment of the present invention also has another application.As in the aforementioned embodiment, the surface 116 of substrate 110 is provided with the linear graduation 121 of figure notation, and this scale is arranged to perpendicular to edge 118, and limits circular degree, and its figure notation is depicted the number of degrees value of each linear graduation.The upper surface 122 of thin plate 111 is provided with linear graduation, and this scale and edge 132 are arranged vertically into 0 °, 90 °, 180 ° and 270 ° of circumference, and delineation is equal to north, south, east and western mark.The upper surface 124 of top lip 112 is provided with linear graduation, and this scale is arranged to perpendicular to edge 134, and qualification and compass graduation northeast, the southeast, northwest and southwestern corresponding top lip 111 linear markers' subregion.Mark on the surface 124 of top lip 112 is equal to each middle compass graduation.The upper surface 126 of thin plate 113 is provided with linear graduation, and this scale is arranged to perpendicular to edge 136, and with corresponding points such as middle compass graduation such as north-northeast, east-northeast, east-southeast on, further segment the subregion on thin plate 112 surfaces 124 again.The surface 126 of thin plate 113 also is provided with the mark that is equal to aforementioned compass graduation.
This embodiment of the present invention also of great use, makes the student can understand the required degree of turn of change moving direction from the first compass graduation to the second compass graduation rapidly in corresponding to the teaching of the circular degree between compass graduation and the compass graduation.
Can improve this embodiment of the present invention, not have the substrate of linear graduation or mark, and replace the linear graduation of each top lip to represent fractional relationship with the dish type figure tabular form mark of substrate by use.A top lip can be depicted as 1/2nd " parts ", another top lip can be depicted as one or more 1/4th " parts ", comprise how 1/2nd " parts " being divided into describing of 1/4th " parts ", another top lip can be depicted as one or more 1/8th " parts ", comprise how each 1/4th " part " being divided into describing of 1/8th " parts ", or the like.
The present invention includes a kind of method,, can express the relation between volume unit, chronomere and the angular measure unit by this method, and with utensil teaching of the present invention.The present invention also comprises a kind of like this method, by this method, can express vector calculus and navigation, and with utensil teaching of the present invention.
The above description of preferred embodiment should be regarded as the explanation of the present invention that is defined by the claims, rather than restriction.Self-evident, not departing under the claim rated condition of the present invention, can take many changes and combination to above-mentioned feature.This change should not think to depart from the spirit and scope of the present invention, and all these improvement all will be included in the scope of following claim.
Claims (8)
1. measure and teaching appliance for one kind, comprising:
(a) substrate, this substrate has end face and the bottom surface reaches the elongated rectangular periphery that is limited by upper and lower long edge and forward and backward minor face edge, described end face has the linear graduation that evenly separates, and described linear graduation is arranged to long edge perpendicular to described, and limits first standard measure of quantity; With
(b) top transparent thin plate, this thin plate has end face and the bottom surface reaches the elongated rectangular periphery that is limited by upper and lower long edge and forward and backward minor face edge, the end face of described top transparent thin plate has the linear graduation that evenly separates, described linear graduation is arranged to the described long edge perpendicular to described top transparent thin plate, and limit second standard measure of quantity, to measure the same parameter of being measured by described first standard measure of quantity;
Wherein, described transparent thin board can place on the described substrate, thereby the described linear graduation that limits described first standard measure of quantity can be aimed at the described linear graduation that limits described second standard measure of quantity, thereby the relation between described first and second measurement unit is shown;
The transparent thin board that at least one is additional, this thin plate has end face and the bottom surface reaches the elongated rectangular periphery that is limited by upper and lower long edge and forward and backward minor face edge, the end face of the transparent thin board that each is additional has the linear graduation that evenly separates, this linear graduation is arranged to the long edge of going up perpendicular to each additional transparent thin board, and limits the different mark increments of described first or second standard measure of quantity; Like this, each additional transparent thin board can place between described substrate and the described top transparent thin plate, so that, the described long edge of each additional transparent thin plate can be aimed at the described long edge of described substrate and described top transparent thin plate, can see described additional transparent thin board linear graduation and see through described top transparent thin plate, concern thereby illustrate between described first and second measurement units on described substrate and the described top transparent thin plate and the described mark increment on each additional transparent thin plate.
2. utensil as claimed in claim 1 is characterized in that, described first standard measure of quantity is made in Great Britain, and described second standard measure of quantity is a metric system.
3. utensil as claimed in claim 1 is characterized in that, described first standard measure of quantity is a metric system, and described second standard measure of quantity is made in Great Britain.
4. utensil as claimed in claim 1 is characterized in that, described measurement unit is linear measurement unit.
5. utensil as claimed in claim 1 is characterized in that described measurement unit is a volumetric metering unit.
6. utensil as claimed in claim 1 is characterized in that described measurement unit is an angular measure unit.
7. measure and teaching appliance for one kind, comprising:
(a) substrate, this substrate has end face and the bottom surface reaches the elongated rectangular periphery that is limited by upper and lower long edge and forward and backward minor face edge, described end face has the linear graduation that evenly separates, described linear graduation is arranged to inch width subregion going up long edge and limit described substrate top surface perpendicular to described, and comprises its at least one non-decimal mark increment arbitrarily; With
(b) top transparent thin plate, this thin plate has end face and the bottom surface reaches the elongated rectangular periphery that is limited by upper and lower long edge and forward and backward minor face edge, the end face of described top transparent thin plate has the linear graduation that evenly separates, described linear graduation is arranged to long edge perpendicular to the described of described top transparent thin plate, and limits the decimal fraction increment of at least one inch width subregion of described end face of described substrate;
Wherein, described top transparent thin plate can place on the described substrate, thereby the described linear graduation that limits described decimal fraction increment can be aimed at the described linear graduation that limits each inch width subregion and arbitrary non-decimal mark increment, thereby described inch and its non-decimal fraction decimalize equivalence value;
The transparent thin board that at least one is additional, this thin plate has end face and the bottom surface reaches the elongated rectangular periphery that is limited by upper and lower long edge and forward and backward minor face edge, each additional transparent thin board end face has the linear graduation that evenly separates, this linear graduation is arranged to the long edge of going up perpendicular to each additional transparent thin board, and limits the different decimal systems and the non-decimal mark increment of described each inch of substrate width subregion; Like this, each additional transparent thin board can place between described substrate and the described top transparent thin plate, so that each additional transparent thin plate described goes up long edge and can that long edge be aimed at and can see described additional transparent thin board linear graduation through described top transparent thin plate with described substrate and described top transparent thin plate described, thus illustrate that each inch width subregion and arbitrary ten on described substrate and the described top transparent thin plate advances and non-decimal fraction increment and each additional transparent thin plate on described ten advance and non-decimal fraction increment between concern.
8. utensil as claimed in claim 7 is characterized in that, the described linear graduation of described top transparent thin plate comprises the linear graduation that limits tens of/one inch.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2001/040928 WO2002101324A1 (en) | 1999-03-16 | 2001-06-12 | Measuring and instructional ruler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1539073A CN1539073A (en) | 2004-10-20 |
| CN1304811C true CN1304811C (en) | 2007-03-14 |
Family
ID=31945402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB018235131A Expired - Fee Related CN1304811C (en) | 2001-06-12 | 2001-06-12 | Measuring and instructional ruler |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1304811C (en) |
| CA (1) | CA2450716C (en) |
| MX (1) | MXPA03011696A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI416067B (en) * | 2006-05-19 | 2013-11-21 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191322508A (en) * | 1913-10-06 | 1914-10-06 | Frederick William Lanchester | Improvements in and relating to Means for Storing and Supplying Liquid Fuel to Internal Combustion Engines. |
| US2118773A (en) * | 1935-03-26 | 1938-05-24 | Robert P Ball | Calculator |
| US2635357A (en) * | 1952-06-10 | 1953-04-21 | Allen M Whitlock | Educational device |
| US3795053A (en) * | 1972-03-10 | 1974-03-05 | D Burke | Combination drafting instrument |
| CN88210779U (en) * | 1988-02-03 | 1988-11-30 | 董全胜 | Multipurpose angle and line mapping rule |
| US5881469A (en) * | 1997-03-07 | 1999-03-16 | Monck; Donna L. | Measuring and instructional ruler |
-
2001
- 2001-06-12 CN CNB018235131A patent/CN1304811C/en not_active Expired - Fee Related
- 2001-06-12 CA CA002450716A patent/CA2450716C/en not_active Expired - Fee Related
- 2001-06-12 MX MXPA03011696A patent/MXPA03011696A/en active IP Right Grant
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191322508A (en) * | 1913-10-06 | 1914-10-06 | Frederick William Lanchester | Improvements in and relating to Means for Storing and Supplying Liquid Fuel to Internal Combustion Engines. |
| US2118773A (en) * | 1935-03-26 | 1938-05-24 | Robert P Ball | Calculator |
| US2635357A (en) * | 1952-06-10 | 1953-04-21 | Allen M Whitlock | Educational device |
| US3795053A (en) * | 1972-03-10 | 1974-03-05 | D Burke | Combination drafting instrument |
| CN88210779U (en) * | 1988-02-03 | 1988-11-30 | 董全胜 | Multipurpose angle and line mapping rule |
| US5881469A (en) * | 1997-03-07 | 1999-03-16 | Monck; Donna L. | Measuring and instructional ruler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI416067B (en) * | 2006-05-19 | 2013-11-21 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1539073A (en) | 2004-10-20 |
| MXPA03011696A (en) | 2004-12-06 |
| CA2450716C (en) | 2008-09-02 |
| CA2450716A1 (en) | 2002-12-19 |
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