CA2054432A1 - Measuring instrument for maps, charts and the like - Google Patents
Measuring instrument for maps, charts and the likeInfo
- Publication number
- CA2054432A1 CA2054432A1 CA002054432A CA2054432A CA2054432A1 CA 2054432 A1 CA2054432 A1 CA 2054432A1 CA 002054432 A CA002054432 A CA 002054432A CA 2054432 A CA2054432 A CA 2054432A CA 2054432 A1 CA2054432 A1 CA 2054432A1
- Authority
- CA
- Canada
- Prior art keywords
- tape
- distance
- measuring instrument
- housing
- microprocessor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/10—Measuring tapes
- G01B3/1061—Means for displaying or assisting reading of length measurement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/10—Measuring tapes
- G01B3/1061—Means for displaying or assisting reading of length measurement
- G01B3/1069—Electronic or mechanical display arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/10—Measuring tapes
- G01B3/1084—Tapes combined with arrangements for functions other than measuring lengths
- G01B3/1094—Tapes combined with arrangements for functions other than measuring lengths for recording information or for performing calculations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/10—Measuring tapes
- G01B3/1003—Measuring tapes characterised by structure or material; characterised by layout or indicia
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
ABSTRACT
The present invention relates to a simple electronic calculating device that facilitates the measuring and use of charts, maps, drawings, plans, etc.. The device is in the form of a retractable tape measure provided with a microprocessor, the tape measure being programmable to relate the scale of the chart, map or the like to the distance moved by the tape and produce a visible readout in real measurement on the tape measure housing of a distance on the chart as measured by the tape.
The present invention relates to a simple electronic calculating device that facilitates the measuring and use of charts, maps, drawings, plans, etc.. The device is in the form of a retractable tape measure provided with a microprocessor, the tape measure being programmable to relate the scale of the chart, map or the like to the distance moved by the tape and produce a visible readout in real measurement on the tape measure housing of a distance on the chart as measured by the tape.
Description
- 1 20~44~2 TECHNIC~L FIELD
The present invention relates to a measuring instrument, adapted to measure and simultaneously convert the distance measured on a chart, map, or the like into real distance.
B~CRGROUND OF THE INVENTION
Measuring instruments such as rulers and tape measures are conventionally used to measure distances. On maps, charts, drawings and the like, once a distance is measured, the user conventionally has to convert the distance so measured into an actual distance according to the scale thereof.
Instruments allowing conversion from one measuring system to another are known. For example, Canadian Patent No. 1,115,376 issued on December 2~, 1981 to Hind discloses a conventional steel rule tape extending outwardly from a housing to measure a distance in one measurement system (e.g. Imperial measure) provided with a converter and visual readout device to convert that distance into another measurement system (e.g. metric) and electronically display the resulting, converted measurement.
There currently however is no device that will provide a user with the ability to simultaneously measure a scaled distance between two points on a map, chart or the like and convert that distance into actual units of measurement. To do so, one must measure that distance using a conventional measuring instrument such as a ruler and/or calipers and then, through a calculation based on the map or chart's scale, convert such distance into an actual distance reading.
With this in mind, one object of the invention is to provide a compact electronic device that can be carried around in a pocket and will let a user simultaneously measure and convert into real distance the linear scaled distance measured between two points on a map, chart or drawing.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a device for measuring a distance between two points on a scaled map, chart, drawing or the like, and converting that distance into real units of measurement. The device comprises a housing and a tape encased within the housing, the tape in operation relatively moveable with respect to the housing to extend outwardly therefrom and to be retracted therein. The device is provided with a point against which to measure the degree of relative linear movement of the tape. The tape along its length is provided with spaced, detectable~indicator means. A sensor means is associated with the housing positioned proximal a portion of the tape to detect passage with respect thereto of the indicator means during movement of the tape a predetermined distance and produce corresponding electronic signals. A microprocessor means incorporating counter means is electronically associated with the sensor means to receive and count electronic signals from the ~ 3 ~ 20~4~2 sensor means. Programmable register means are electronically associated with said counter means to receive data from said counter means. Calibration means are electronically associated with the register means arranged so as to provide thereto data correlating movement of the tape a predetermined distance to a scale unit of the map, chart, drawing or the like. A visual display means is provided on the housing, electronically associated with the microprocessor. The microprocessor is programmed so as to merge data recorded by the register means from the calibration means with data recorded by the register means from said counter means during a measurement of a distance of said map and convert that distance into real units of measurement in accordance with the scale unit and display the resulting calculation on the visual display means.
The present invention provides a simple electronic calculating device that facilitates the measuring and use of charts, maps, drawings, plans, etc..
BRIEF DE8CRIPTION OF T~IE DRI~WINGS
These and other objects and advantages of the invention will become apparent upon reading the followin~ detailed description and upon referring to the drawings in which:
FIGURE 1 is a perspective view of the measuring and calculating instrument of the invention.
FIGURE 2 is a schematic representation of the different components of the instrument of FIGURE 1.
- 4 - ~0~44~2 FIGURE 3 is a block diagram showing the interaction of the electronic components of the invention.
While the invention will be described in conjunction with an example embodiment, it wil~ be understood that it is not intended to limit the invention to such embodiment. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
DETAILED DE~CRIPTION OF T~IE INVEN~ION
In the drawings similar features have been given similar reference numerals.
Turning to FIGURE 1 there is a device 2 for measuring a distance between two points on a scaled map, chart, drawing and converting the distance into real units of measurement.
The device comprises an elongated rectangular housing 4 within which is normally engaged on a rotating spool 6 a tape 8.
End 10 of the tape 8 may be drawn so that it extends linearly outwardly from the housing. In one embodiment of the invention, tape 8 is transparent so it does not obscure matter on the map, chart or drawing beneath it. Tape 8 has along its length, regularly spaced apart indicators 12 that may be delineated by conventional visual means or alternatively, as illustrated by magnetic fields or the like. These are preferably equally spaced and may, as illustrated in Fiyure 2, be positioned along one edge of the tape 8.
_ 5 _ 20~ 4 4 3 2 A benchmark point 14 is positioned proximal to the location where the tape 8 exits of the housing 4 to be used to position device ~ when commencing to measure the distance between two points using tape 8.
Adjacent the top, although locatable at any desired position is a visual readout display window 16 within which is positioned an eight character L.C.D. display module 18 (FIGURE 2).
A numeric keyboard 20 with numerous pushbuttons 22 each responding to a particular different digit from 0 to 9, together with a lock-in-scale button and switch 24 enable a user to calibrate the device
The present invention relates to a measuring instrument, adapted to measure and simultaneously convert the distance measured on a chart, map, or the like into real distance.
B~CRGROUND OF THE INVENTION
Measuring instruments such as rulers and tape measures are conventionally used to measure distances. On maps, charts, drawings and the like, once a distance is measured, the user conventionally has to convert the distance so measured into an actual distance according to the scale thereof.
Instruments allowing conversion from one measuring system to another are known. For example, Canadian Patent No. 1,115,376 issued on December 2~, 1981 to Hind discloses a conventional steel rule tape extending outwardly from a housing to measure a distance in one measurement system (e.g. Imperial measure) provided with a converter and visual readout device to convert that distance into another measurement system (e.g. metric) and electronically display the resulting, converted measurement.
There currently however is no device that will provide a user with the ability to simultaneously measure a scaled distance between two points on a map, chart or the like and convert that distance into actual units of measurement. To do so, one must measure that distance using a conventional measuring instrument such as a ruler and/or calipers and then, through a calculation based on the map or chart's scale, convert such distance into an actual distance reading.
With this in mind, one object of the invention is to provide a compact electronic device that can be carried around in a pocket and will let a user simultaneously measure and convert into real distance the linear scaled distance measured between two points on a map, chart or drawing.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a device for measuring a distance between two points on a scaled map, chart, drawing or the like, and converting that distance into real units of measurement. The device comprises a housing and a tape encased within the housing, the tape in operation relatively moveable with respect to the housing to extend outwardly therefrom and to be retracted therein. The device is provided with a point against which to measure the degree of relative linear movement of the tape. The tape along its length is provided with spaced, detectable~indicator means. A sensor means is associated with the housing positioned proximal a portion of the tape to detect passage with respect thereto of the indicator means during movement of the tape a predetermined distance and produce corresponding electronic signals. A microprocessor means incorporating counter means is electronically associated with the sensor means to receive and count electronic signals from the ~ 3 ~ 20~4~2 sensor means. Programmable register means are electronically associated with said counter means to receive data from said counter means. Calibration means are electronically associated with the register means arranged so as to provide thereto data correlating movement of the tape a predetermined distance to a scale unit of the map, chart, drawing or the like. A visual display means is provided on the housing, electronically associated with the microprocessor. The microprocessor is programmed so as to merge data recorded by the register means from the calibration means with data recorded by the register means from said counter means during a measurement of a distance of said map and convert that distance into real units of measurement in accordance with the scale unit and display the resulting calculation on the visual display means.
The present invention provides a simple electronic calculating device that facilitates the measuring and use of charts, maps, drawings, plans, etc..
BRIEF DE8CRIPTION OF T~IE DRI~WINGS
These and other objects and advantages of the invention will become apparent upon reading the followin~ detailed description and upon referring to the drawings in which:
FIGURE 1 is a perspective view of the measuring and calculating instrument of the invention.
FIGURE 2 is a schematic representation of the different components of the instrument of FIGURE 1.
- 4 - ~0~44~2 FIGURE 3 is a block diagram showing the interaction of the electronic components of the invention.
While the invention will be described in conjunction with an example embodiment, it wil~ be understood that it is not intended to limit the invention to such embodiment. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
DETAILED DE~CRIPTION OF T~IE INVEN~ION
In the drawings similar features have been given similar reference numerals.
Turning to FIGURE 1 there is a device 2 for measuring a distance between two points on a scaled map, chart, drawing and converting the distance into real units of measurement.
The device comprises an elongated rectangular housing 4 within which is normally engaged on a rotating spool 6 a tape 8.
End 10 of the tape 8 may be drawn so that it extends linearly outwardly from the housing. In one embodiment of the invention, tape 8 is transparent so it does not obscure matter on the map, chart or drawing beneath it. Tape 8 has along its length, regularly spaced apart indicators 12 that may be delineated by conventional visual means or alternatively, as illustrated by magnetic fields or the like. These are preferably equally spaced and may, as illustrated in Fiyure 2, be positioned along one edge of the tape 8.
_ 5 _ 20~ 4 4 3 2 A benchmark point 14 is positioned proximal to the location where the tape 8 exits of the housing 4 to be used to position device ~ when commencing to measure the distance between two points using tape 8.
Adjacent the top, although locatable at any desired position is a visual readout display window 16 within which is positioned an eight character L.C.D. display module 18 (FIGURE 2).
A numeric keyboard 20 with numerous pushbuttons 22 each responding to a particular different digit from 0 to 9, together with a lock-in-scale button and switch 24 enable a user to calibrate the device
2 as will be described in more detail subsequently to the particular scale of a map, chart or the like.
Tape 8 may be a conventional tape, rigid in its plane of extension or one which may be flexible in that plane. As can be seen in Figure 2, the housing 4 contains, proximal to the tape 8, sensor 26. ~ensor 26 is adapted to detect passage by it of each indicator 12 during movement of the tape 8. Thus, when those indicators are magnetic fields, each magnetic field passing sensor 26 will produce a corresponding electronic signal.
Within housing 4, as can be seen in FIGURES 2 and 3, is a microprocessor 30. Components of that microprocessor include (FIGURE 3) distance counter 32, register 34, and multiplier 36.
Lock-in-scale button and switch 24, used for calibration of microprocessor 30, is electronically associated with register 34 as illustrated.
Electronic signals detected by motion sensor 26, by movement of tape 8 during a measurement are passed to distance - 6 - 20~4~32 counter 32 electronic signals, representing the number of magnetic fields detected by sensor 26, are passed from counter 32 to register 34 that then keeps in memory the number of electronic signals sensed during a particular measurement. Calibrate Switch 24 is used to program register 34 with the number of indicators 12 making up a unit measurement in the scale of the map, chart or the like. Numeric keyboard 20 is used to then program register 34, through multiplier 36, with the proper factor for converting such unit of measurement on the map or chart into actual or real measurement units, according to the map or chart scale, so that then, when tape 8 is extended out of housing 4 a particular distance measured by the distance between benchmark point 14 and the end of tape 10, for exa~ple, the actual distance, in real units of measurement, is computed by microprocessor 30 based on the maps scale, and displayed by the L.C.D. display in window 16.
More particularly, to use device 2, benchmark point 14 is placed at one point on the scale of a map and end 10 of tape 8 is extended outwardly from housing 4 to the other end of the scale.
Motion sensor 26 at that point has detected, and distance counter 32 counted, the indicators 12 constituting a unit of distance according to the scale on the map. Scale calibrate switch is then activated to maintain that number or value in memory in register 34. The user, then, by operating numeric buttons 22 on numeric keyboard 20, introduces the conversion factor, from scale unit to real units of measurement, and programs microprocessor 30 accordingly. With the microprocessor thus programmed with the scale and conversion of that scale to real units in accordance with ~ 7 ~ 20~4432 the distance moved by the end of tape 10 from its initial position adjacent benchmark 14, extending tape 8 along any distance to be measured on the map will automatically provide, in L.C.D. display 18 through window 16, the real distance between the two points measured on the map.
Other, conventional functions and associated buttons and associated switches may be provided in keyboard 20, such as a cancel button 40 for clearing register 34 and microprocessor 30 from unit calibration data and skill conversion data. As well, by enabling microprocessor 30 to carry out simple mathematical functions such as multiplication and division, and by appropriately programming microprocessor 30 in a conventional manner, speed, distance and time calculations can be readily carried out using device 2. In this instance, for example, once the distance between two points on a map is known using the device as has been previously described herein, by entering the speed of the user's vehicle, the estimated time required to cover the distance in question can be easily computed and displayed on L.C.D. display model 18.
As well, motion sensor 26 may be accompanied by a direction sensor 50, as illustrated, and distance counter 32 then programmed to add indicators 12 when tape 8 is moved in one direction, and subtract when it is moved in the other. This may be achieved, for example, when indicators 12 are magnetic fields, simply by having motion sensor 26 detect the opposite magnetic field when tape 8 is moved in the opposite direction. Such a modification of device 2 would, for example, facilitate - 8 - 20 ~ 4 43 2 calculations of distances on navigational charts where a trip may incorporate movement in opposite directions at different times of the trip.
Thus it is apparent that there has been provided in accordance with the invention that fully satisfies the objects, aims and advantages set forth above. While the invention has been described in conjunction with a specific embodiment thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of the invention.
' ~
Tape 8 may be a conventional tape, rigid in its plane of extension or one which may be flexible in that plane. As can be seen in Figure 2, the housing 4 contains, proximal to the tape 8, sensor 26. ~ensor 26 is adapted to detect passage by it of each indicator 12 during movement of the tape 8. Thus, when those indicators are magnetic fields, each magnetic field passing sensor 26 will produce a corresponding electronic signal.
Within housing 4, as can be seen in FIGURES 2 and 3, is a microprocessor 30. Components of that microprocessor include (FIGURE 3) distance counter 32, register 34, and multiplier 36.
Lock-in-scale button and switch 24, used for calibration of microprocessor 30, is electronically associated with register 34 as illustrated.
Electronic signals detected by motion sensor 26, by movement of tape 8 during a measurement are passed to distance - 6 - 20~4~32 counter 32 electronic signals, representing the number of magnetic fields detected by sensor 26, are passed from counter 32 to register 34 that then keeps in memory the number of electronic signals sensed during a particular measurement. Calibrate Switch 24 is used to program register 34 with the number of indicators 12 making up a unit measurement in the scale of the map, chart or the like. Numeric keyboard 20 is used to then program register 34, through multiplier 36, with the proper factor for converting such unit of measurement on the map or chart into actual or real measurement units, according to the map or chart scale, so that then, when tape 8 is extended out of housing 4 a particular distance measured by the distance between benchmark point 14 and the end of tape 10, for exa~ple, the actual distance, in real units of measurement, is computed by microprocessor 30 based on the maps scale, and displayed by the L.C.D. display in window 16.
More particularly, to use device 2, benchmark point 14 is placed at one point on the scale of a map and end 10 of tape 8 is extended outwardly from housing 4 to the other end of the scale.
Motion sensor 26 at that point has detected, and distance counter 32 counted, the indicators 12 constituting a unit of distance according to the scale on the map. Scale calibrate switch is then activated to maintain that number or value in memory in register 34. The user, then, by operating numeric buttons 22 on numeric keyboard 20, introduces the conversion factor, from scale unit to real units of measurement, and programs microprocessor 30 accordingly. With the microprocessor thus programmed with the scale and conversion of that scale to real units in accordance with ~ 7 ~ 20~4432 the distance moved by the end of tape 10 from its initial position adjacent benchmark 14, extending tape 8 along any distance to be measured on the map will automatically provide, in L.C.D. display 18 through window 16, the real distance between the two points measured on the map.
Other, conventional functions and associated buttons and associated switches may be provided in keyboard 20, such as a cancel button 40 for clearing register 34 and microprocessor 30 from unit calibration data and skill conversion data. As well, by enabling microprocessor 30 to carry out simple mathematical functions such as multiplication and division, and by appropriately programming microprocessor 30 in a conventional manner, speed, distance and time calculations can be readily carried out using device 2. In this instance, for example, once the distance between two points on a map is known using the device as has been previously described herein, by entering the speed of the user's vehicle, the estimated time required to cover the distance in question can be easily computed and displayed on L.C.D. display model 18.
As well, motion sensor 26 may be accompanied by a direction sensor 50, as illustrated, and distance counter 32 then programmed to add indicators 12 when tape 8 is moved in one direction, and subtract when it is moved in the other. This may be achieved, for example, when indicators 12 are magnetic fields, simply by having motion sensor 26 detect the opposite magnetic field when tape 8 is moved in the opposite direction. Such a modification of device 2 would, for example, facilitate - 8 - 20 ~ 4 43 2 calculations of distances on navigational charts where a trip may incorporate movement in opposite directions at different times of the trip.
Thus it is apparent that there has been provided in accordance with the invention that fully satisfies the objects, aims and advantages set forth above. While the invention has been described in conjunction with a specific embodiment thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of the invention.
' ~
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for measuring a distance between two points on a scaled map, chart, drawing or the like, and converting that distance into real units of measurement, the device comprising a housing; a tape encased within the housing, the tape in operation relatively moveable with respect to the housing outwardly therefrom to extend and to be retracted therein the device having a point from which to measure the degree of relative movement of the tape.
The tape along its length being provided with spaced, detectable indicator means; sensor means associated with the housing positioned proximal a portion of the tape to detect passage with respect thereto of said indicator means during movement of the tape a predetermined distance and produce corresponding electronic signals; microprocessor means incorporating counter means electronically associated with said sensor means to receive and count electronic signals from said sensor means, programmable register means electronically associated with said counter means to receive data from said counter means, calibration means electronically associated with the register means and arranged so as to provide thereto data correlating movement of the tape a predetermined distance to a scale unit of the map, chart, drawing or the like and visual display means on said housing electronically and associated with the microprocessor, the microprocessor programmed so as to merge data recorded by the register means from said calibration means with data recorded by the register means from said counter means during a measurement of a distance of said map, convert that distance into real units of measurement in accordance with the scale unit and display the resulting calculation on said visual display means.
The tape along its length being provided with spaced, detectable indicator means; sensor means associated with the housing positioned proximal a portion of the tape to detect passage with respect thereto of said indicator means during movement of the tape a predetermined distance and produce corresponding electronic signals; microprocessor means incorporating counter means electronically associated with said sensor means to receive and count electronic signals from said sensor means, programmable register means electronically associated with said counter means to receive data from said counter means, calibration means electronically associated with the register means and arranged so as to provide thereto data correlating movement of the tape a predetermined distance to a scale unit of the map, chart, drawing or the like and visual display means on said housing electronically and associated with the microprocessor, the microprocessor programmed so as to merge data recorded by the register means from said calibration means with data recorded by the register means from said counter means during a measurement of a distance of said map, convert that distance into real units of measurement in accordance with the scale unit and display the resulting calculation on said visual display means.
2. The measuring instrument of claim 1 further comprising a numeric keyboard means arranged to enable a user to manually program the microprocessor means with real units of measurement.
3. The measuring instrument of claim 1 wherein the distance indicator means are magnetically detectable.
4. The measuring instrument of claim 1 wherein the tape is made of transparent material.
5. The measuring instrument of claim 1 wherein the distance indicator means are spaced apart at regular intervals.
6. The measuring instrument of claim 6 wherein the distance indicator means are made of regularly spaced apart strips of magnetic material secured along an edge of the tape.
7. The measuring instrument of claim 1 wherein the tape is flexible in the plane of measurement.
8. The measuring instrument of claim 1 wherein said point from which to measure the degree of relative movement of the tape is on the housing.
9. The measuring instrument of claim 1 further provided with direction sensor means electronically associated with the counter means, the counter means arranged so as to subtract from its count electronically signals from the sensor means when the tape is moved in an opposite direction.
10. The measuring instrument of claim 2 wherein the microprocessor is programmed to calculate speed, distance and time measurements and the housing is provided with keyboard and switch means to input any two values of speed, time or distance so as to generate, through the microprocessor, a calculation of the third.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002054432A CA2054432A1 (en) | 1991-10-29 | 1991-10-29 | Measuring instrument for maps, charts and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002054432A CA2054432A1 (en) | 1991-10-29 | 1991-10-29 | Measuring instrument for maps, charts and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2054432A1 true CA2054432A1 (en) | 1993-04-30 |
Family
ID=4148658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002054432A Abandoned CA2054432A1 (en) | 1991-10-29 | 1991-10-29 | Measuring instrument for maps, charts and the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2054432A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691923A (en) * | 1995-04-25 | 1997-11-25 | Levi Strauss & Co. | Digital measuring system |
| EP0896199A1 (en) * | 1997-08-07 | 1999-02-10 | K. Trenfield | Electronic tape measure |
-
1991
- 1991-10-29 CA CA002054432A patent/CA2054432A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691923A (en) * | 1995-04-25 | 1997-11-25 | Levi Strauss & Co. | Digital measuring system |
| EP0896199A1 (en) * | 1997-08-07 | 1999-02-10 | K. Trenfield | Electronic tape measure |
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| Date | Code | Title | Description |
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| FZDE | Dead |