CA1145540A - Electronic length measuring device comprising a measuring tape which is rolled up in a gauging station - Google Patents
Electronic length measuring device comprising a measuring tape which is rolled up in a gauging stationInfo
- Publication number
- CA1145540A CA1145540A CA000373092A CA373092A CA1145540A CA 1145540 A CA1145540 A CA 1145540A CA 000373092 A CA000373092 A CA 000373092A CA 373092 A CA373092 A CA 373092A CA 1145540 A CA1145540 A CA 1145540A
- Authority
- CA
- Canada
- Prior art keywords
- tape
- measuring
- gauging station
- length
- measuring tape
- 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.)
- Expired
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- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention refers to an electronic length measuring device by which elongated articles as for example planks (5) can be easily measured and the total cost of which can be easily calculated. The invention substantially comprises a measuring tape which can be pulled out from the gauging station (1), and at the free end of which an operating device (3) is arranged. The measuring tape (2) is provided with a number of detectable elements (11) arranged along the measuring tape (2) at equal distances from each other. The detectable elements (11) are detected by a detector (8) arranged in the gauging station (1), the signals of which are supplied to an electronic unit. The operating device (3) is furthermore provided with at least one switch (15) by means of which the operator is able to initiate the electronic unit (14) to accumulate measured length values to a memory (22). This memory (22) would be updated each time the switch (15) is manually activated and the value accumulated in the memory (22) is shown on a sum display (20). The electric signals thus generated in the operating device (3) are transmitted by nhe transmission elements (12,13) which for example can consist of electric conductors to the gauging station (1) and the electronic unit (14), said electric conductors being arranged in the measuring tape (2). P13147SE-BE-MR-SC / 810227
Description
S~'~O
An electronic length measuring device comprising a mea~uring-tape which i8 rolled up ln a gauging station.
Back~round of the invention The present invention refers to an electronic length measuring device, especially intended for mea3uring and 3ummation of length3 oP wood- or 3teel goods, comprising a measuring tape which is rolled up in a gauging ~tation.
At retail ~ale of for example wood-products the lengths of the wood-products are measured with the assistance of conventional folding rules, measuring-tapes or some kind of measuring-planks. The lengths of the wood-products are there-after ~ummed up by hand or with the as3iYtance of a mechanical or an electronical calculator. This procedure i~
of courqe time-wasting and there is a great risk of getting incorrect readings and incorrect 3ummation~.
In recent years more automatically working length measuring devices have been development. Such a lenght measuring device is described in for example the DE-OS No. 2.826.030. This publication shows a measuring equipment in which an extensible measuring-tape is included and with such an equip-ment different lengthq can be measured. The measuring-tape i~
provided with perforations which engage a gear wheel. The gear wheel is arranged at the end of an axle on the opposite end of which a rotary di~k is mounted. The disk iq provided with a number of holes arranged in a circle near the periphery of the -disk. A detecting-device is arranged to detect the number of holes that passe~ through the detecting-device.
.
The thus demonstrated testing-device is suffering from several disadvantages. One disadvantage i9 that when measuring wood-products, aq planks and other long articles, the operator first manually haq to unwind the measuring-tape to the full length of the measuring object, thereafter go back~ to the mea3uring equipment and initiate a measuring in-~ssJ~o ~truction to the electronic~ by puqhing a ~witch~ Thi~ proce-dure mu~t than be repeated for every measuring ob~ect. Thi~
re~ults in a ~low measuring procedure and compared to a con-ventional meaAuring system no time ~aving to ~peak of i9 obtained. Furthermore no automatic summation iq obtained in a caqe when a number of meaquring ob~ect~ are to be meaQured and qummed up, which often is the ca~e when wood-articles and the like is meaqured. An additional diqadvantage is the problem of at which direction the tape iq running at the different measuring occasion~. Thiq has not either been ~ati~factory ~olved, which mean3 that incorrect reading~ can occur if the operator, when mea~uring the length, allows the tape to move in and out at the same mea~urement occa~ion.
Summary of the invention The object of the pre~ent invention iQ to eliminate the above mentioned disadvantageq and to provide a length mea~uring device that is simple to handle and which eliminate~ qeveral working momentq when measuring for exmple wood articles. This has according to the invention been achieved by the fact that an operating device iq arranged at the free end of the mea-~uring tape, that the measuring tape iq provided with detectable elementq arranged along the meaquring tape at an equal distance from each other, that a detector i~ arranged to automatically detect the detectable elementq located in the measuring tape, that transmi~sion meanq are arranged to tran~mit electric signalq between the operating device and an electronic unit, arranged in the gauging ~tation, ~o that measured length values are accumulated to a memory arranged in the electronic unit at manual initiation of a ~witch arranged at the operating device.
Brief de~cription of the drawing~
A preferred embodiment of the invention will below be deqcribed with reference to the attached drawing~.
~55~
Figure 1 i~ a view of the measuring device located at a measuring table, Figure 2 is a view of the most important mechanical parts of the length mea~uring device, and Figure 3 is a block diagram o~ the electronics of the length measuring device.
Description of a preferred embodiment In figure 1 a length measuring device according to the invention i~ ~hown mainly comprising a gauging station 1, a measuring tape 2 and an operating device 3. The length mea-~uring device is preferably located on or beqide a measuring table 4, de~igned for elongated objects ~uch a~ planks 5 and the l~ike. The gauging ~tation 1 i3 preferably mounted in connection to a ledge 6 at one end of the mea~uring table 4.
Figure 2 ~hows the mea~uring tape 2 partly rolled up on a wind-up drum 7. The drum i3 spring-loaded (not ~hown) 90 that the tape will roll up again when the tape has been drawn-out and than i~ released. An operating device 3 i~ arranged at the oppo~ite free end of the mea~uring tape 2. Gn the way from the collect drum 7 the mea~uring tape 2 i~ running through a detector 8. Detectable elements arranged in the measuring tape 2 are detected by means of two ~ensors 9,10 arranged in the detector 8. The detectable elements 11 preferably comprise perforations arranged along the measuring tape 2 at equal di~tances from each other, for example 1 cm.
The detectable elements 11 can of course be de~igned in other ways, for example by optical markings or by ~mall magnet~
included in the mea~uring tape 2. Dependent on which type of detectable elements 11 that are used the sensor element~ 9,10 are adapted, ~o that a confident detection of each detectable element 11 $9 obtained. In ca3e~ where the detectable elements 11 are pçrforat~ons the sensors 9,10 preferably compri~e light sensitized photo-tran~1~torY arranged in the detector 8 on the top of the mea~urlng tape 2. Some kind of light source, for example light emitting diodes tnot shown), are arranged in the detector 8 below the mea3uring tape 2.
The sensors 9,10 are arranged at a distance from each other of 1,5 time~ the distance between the detectable elements 11 in the measuring tape 2. When the measuring tape 2 is moved out or in, two pulse trains 90 out of phase from each other are generated from the sensor~ g~10. The phase sequen~e will thereby indicate whether the mea~uring tape 2 is moving into or out of the gauging ~tation 1.
The measuring equipment is alqo provided with a transmission element 12,13 for transmitting signals generated in the operating de~ice 3. The transmis~ion element 12,13 can for example consist of electric conductors arranged in the mea-suring tape 2 arranged either on one side of the measuring tape 2 or included in the measuring tape 2. The~e electric conductors 12,13 connect the electronic circuits 14 arranged in the gauging station 1, with the operating device 3 arranged in the free end of the measuring tape 2. The opera-ting device 3 i~ provided with at least one switch 15, which by manual influence generateY a signal which is transmitted by the conductors 12,13 to the electronic unit 14 in the gauging station 1. The transmission element~ ~2,13 can inqtead of electric conductor~ comprise transmitter- and receiver units (not shown) for wireless tranqmiqsion.
Consequently a transmitter unit is arranged in the operat~ng device 3 and a receiver unit in the gauging station 1 for transmission of signals from the operating device 3 to the gauging station 1. The transmitter- and receiver units oould be arranged for transmission of qupersonic signals, infra-light signals or electromagnetic signalY.
In figure 3 a po~sible design of the electronic unit 14 i~
illustrated, the conqtruction of which mainly is of conven-tional type and therefore here only ~s described ln the form of a blockdiagram. The electronic unit iq here illu.qtrated in four electronic blocks and t~o display blocks where a first block consist of a detector 16, a second block consist of a forward-back-calculator 17, a third block conqist of an summation unit 12, together with a fourth block, which of a memory 22. The results of the measurings and calculationR are 11~55~
partly shown on a measure display 19, and partly on a sum d1splay 20. A switch 21 for ~etting to zero i~ partly connec-ted to the forward-back-calculator 17 and partly to the ~ummation unit 18. From the detector 8 electrlc signals are tran~mitted in the form Or a pulse train, which is generated when the mea~uring tape 2 iq di~placed into or out of the gauging station 1 to the detector 16. The detector 16 is furthermore in electr~c connection with the forward-back-calculator 17. The forward-back-calculator 17 i~ in electric connection both with the mea~ure display 19 and with the summation un~t 18. The ~ummation unit 18 is in connection with the ~um display 20, the switch 21 for ~etting to zero and with the operating device 3, by the two electric conductors 12,13 arranged in the measuring tape 2 and a rotatable cable in the centre of the drum 7 (not shown).
Function When articles like elongated wood articles of different kind~
are to be measured by means of the present invention the article~ are arranged at the measure table 4 and so adjusted that their ends are in close contact with the ledge 6. The gauging station 1 is 30 arranged that the measuring tape 2 can be drawn out and run parallel with the measure ob~ectq.
Before beginning the meqsuring i.e. before the measuring tape
An electronic length measuring device comprising a mea~uring-tape which i8 rolled up ln a gauging station.
Back~round of the invention The present invention refers to an electronic length measuring device, especially intended for mea3uring and 3ummation of length3 oP wood- or 3teel goods, comprising a measuring tape which is rolled up in a gauging ~tation.
At retail ~ale of for example wood-products the lengths of the wood-products are measured with the assistance of conventional folding rules, measuring-tapes or some kind of measuring-planks. The lengths of the wood-products are there-after ~ummed up by hand or with the as3iYtance of a mechanical or an electronical calculator. This procedure i~
of courqe time-wasting and there is a great risk of getting incorrect readings and incorrect 3ummation~.
In recent years more automatically working length measuring devices have been development. Such a lenght measuring device is described in for example the DE-OS No. 2.826.030. This publication shows a measuring equipment in which an extensible measuring-tape is included and with such an equip-ment different lengthq can be measured. The measuring-tape i~
provided with perforations which engage a gear wheel. The gear wheel is arranged at the end of an axle on the opposite end of which a rotary di~k is mounted. The disk iq provided with a number of holes arranged in a circle near the periphery of the -disk. A detecting-device is arranged to detect the number of holes that passe~ through the detecting-device.
.
The thus demonstrated testing-device is suffering from several disadvantages. One disadvantage i9 that when measuring wood-products, aq planks and other long articles, the operator first manually haq to unwind the measuring-tape to the full length of the measuring object, thereafter go back~ to the mea3uring equipment and initiate a measuring in-~ssJ~o ~truction to the electronic~ by puqhing a ~witch~ Thi~ proce-dure mu~t than be repeated for every measuring ob~ect. Thi~
re~ults in a ~low measuring procedure and compared to a con-ventional meaAuring system no time ~aving to ~peak of i9 obtained. Furthermore no automatic summation iq obtained in a caqe when a number of meaquring ob~ect~ are to be meaQured and qummed up, which often is the ca~e when wood-articles and the like is meaqured. An additional diqadvantage is the problem of at which direction the tape iq running at the different measuring occasion~. Thiq has not either been ~ati~factory ~olved, which mean3 that incorrect reading~ can occur if the operator, when mea~uring the length, allows the tape to move in and out at the same mea~urement occa~ion.
Summary of the invention The object of the pre~ent invention iQ to eliminate the above mentioned disadvantageq and to provide a length mea~uring device that is simple to handle and which eliminate~ qeveral working momentq when measuring for exmple wood articles. This has according to the invention been achieved by the fact that an operating device iq arranged at the free end of the mea-~uring tape, that the measuring tape iq provided with detectable elementq arranged along the meaquring tape at an equal distance from each other, that a detector i~ arranged to automatically detect the detectable elementq located in the measuring tape, that transmi~sion meanq are arranged to tran~mit electric signalq between the operating device and an electronic unit, arranged in the gauging ~tation, ~o that measured length values are accumulated to a memory arranged in the electronic unit at manual initiation of a ~witch arranged at the operating device.
Brief de~cription of the drawing~
A preferred embodiment of the invention will below be deqcribed with reference to the attached drawing~.
~55~
Figure 1 i~ a view of the measuring device located at a measuring table, Figure 2 is a view of the most important mechanical parts of the length mea~uring device, and Figure 3 is a block diagram o~ the electronics of the length measuring device.
Description of a preferred embodiment In figure 1 a length measuring device according to the invention i~ ~hown mainly comprising a gauging station 1, a measuring tape 2 and an operating device 3. The length mea-~uring device is preferably located on or beqide a measuring table 4, de~igned for elongated objects ~uch a~ planks 5 and the l~ike. The gauging ~tation 1 i3 preferably mounted in connection to a ledge 6 at one end of the mea~uring table 4.
Figure 2 ~hows the mea~uring tape 2 partly rolled up on a wind-up drum 7. The drum i3 spring-loaded (not ~hown) 90 that the tape will roll up again when the tape has been drawn-out and than i~ released. An operating device 3 i~ arranged at the oppo~ite free end of the mea~uring tape 2. Gn the way from the collect drum 7 the mea~uring tape 2 i~ running through a detector 8. Detectable elements arranged in the measuring tape 2 are detected by means of two ~ensors 9,10 arranged in the detector 8. The detectable elements 11 preferably comprise perforations arranged along the measuring tape 2 at equal di~tances from each other, for example 1 cm.
The detectable elements 11 can of course be de~igned in other ways, for example by optical markings or by ~mall magnet~
included in the mea~uring tape 2. Dependent on which type of detectable elements 11 that are used the sensor element~ 9,10 are adapted, ~o that a confident detection of each detectable element 11 $9 obtained. In ca3e~ where the detectable elements 11 are pçrforat~ons the sensors 9,10 preferably compri~e light sensitized photo-tran~1~torY arranged in the detector 8 on the top of the mea~urlng tape 2. Some kind of light source, for example light emitting diodes tnot shown), are arranged in the detector 8 below the mea3uring tape 2.
The sensors 9,10 are arranged at a distance from each other of 1,5 time~ the distance between the detectable elements 11 in the measuring tape 2. When the measuring tape 2 is moved out or in, two pulse trains 90 out of phase from each other are generated from the sensor~ g~10. The phase sequen~e will thereby indicate whether the mea~uring tape 2 is moving into or out of the gauging ~tation 1.
The measuring equipment is alqo provided with a transmission element 12,13 for transmitting signals generated in the operating de~ice 3. The transmis~ion element 12,13 can for example consist of electric conductors arranged in the mea-suring tape 2 arranged either on one side of the measuring tape 2 or included in the measuring tape 2. The~e electric conductors 12,13 connect the electronic circuits 14 arranged in the gauging station 1, with the operating device 3 arranged in the free end of the measuring tape 2. The opera-ting device 3 i~ provided with at least one switch 15, which by manual influence generateY a signal which is transmitted by the conductors 12,13 to the electronic unit 14 in the gauging station 1. The transmission element~ ~2,13 can inqtead of electric conductor~ comprise transmitter- and receiver units (not shown) for wireless tranqmiqsion.
Consequently a transmitter unit is arranged in the operat~ng device 3 and a receiver unit in the gauging station 1 for transmission of signals from the operating device 3 to the gauging station 1. The transmitter- and receiver units oould be arranged for transmission of qupersonic signals, infra-light signals or electromagnetic signalY.
In figure 3 a po~sible design of the electronic unit 14 i~
illustrated, the conqtruction of which mainly is of conven-tional type and therefore here only ~s described ln the form of a blockdiagram. The electronic unit iq here illu.qtrated in four electronic blocks and t~o display blocks where a first block consist of a detector 16, a second block consist of a forward-back-calculator 17, a third block conqist of an summation unit 12, together with a fourth block, which of a memory 22. The results of the measurings and calculationR are 11~55~
partly shown on a measure display 19, and partly on a sum d1splay 20. A switch 21 for ~etting to zero i~ partly connec-ted to the forward-back-calculator 17 and partly to the ~ummation unit 18. From the detector 8 electrlc signals are tran~mitted in the form Or a pulse train, which is generated when the mea~uring tape 2 iq di~placed into or out of the gauging station 1 to the detector 16. The detector 16 is furthermore in electr~c connection with the forward-back-calculator 17. The forward-back-calculator 17 i~ in electric connection both with the mea~ure display 19 and with the summation un~t 18. The ~ummation unit 18 is in connection with the ~um display 20, the switch 21 for ~etting to zero and with the operating device 3, by the two electric conductors 12,13 arranged in the measuring tape 2 and a rotatable cable in the centre of the drum 7 (not shown).
Function When articles like elongated wood articles of different kind~
are to be measured by means of the present invention the article~ are arranged at the measure table 4 and so adjusted that their ends are in close contact with the ledge 6. The gauging station 1 is 30 arranged that the measuring tape 2 can be drawn out and run parallel with the measure ob~ectq.
Before beginning the meqsuring i.e. before the measuring tape
2 i8 drawn out of the gauging station 1 the electronic unit 14 is preferably put in a zero poqition by mean~ of the swit~h 21. The gauging ~tation 1 doeq not necessarily have to be located tight with the ledge 6 or the ends of the measure ob~ects 5 but the gauging station 1 can be located for example at a di~tance from the ends of the measure ob~ects 5, preferably somewhere in longitudinal direction of the meaqure ob~ects 5. The ledge becomeR in this way "floating" i.e. the measure ob~ec~s 5 do not need to be arranged tight to the gauging station 1.
The mea~uring tape 2 and with that the operating device 3 is then pulled out to the other, opposite end of the first mea-sure ob~ect, at which a marketing or a ledge 23 on the opera-55~LO
ting device 3 is adjusted in level with the end of the mea-sure object. It is now possible to immediately read the length of the measure object on the measure display 19, which best is arranged in the gauging station 1 in such a way that it easily can be read from the free end of the measuring tape 2. If the switch 15 is pushed in this position the measured length value is accumulated in the memory 22 connected to the summation unit 18 and is shown on the sum display 20. The operating device 3 is hereafter moved to the end of the next measure object, where the procedure is repeated. In this way alla measure object that have been piled up on the measure table 4 easily can be measured, at which all the length values automatically are added up and shown on the sum dis-play 20. The measure objects 5 does of course not need to be arranged at a measure table 4 but the invention can be used for measuring any separate measure objects. When all measure objects have been measured one can easily read the total length of the measured objects on the sum display 20.
By providing the gauging station 1 with an additional calculation circuit (not shown) and a key set 24 connected thereto it is for example possible that a standard price, as price per meter, for the respective article can be fed in,at which the gauging station 1 automatically calculates the cost for the measured articles. The thus calculated total price is shown on an additional display (not shown).
The device can also be provided with a number calculator which shows how many times the switch 15 has been pushed.
The invention is of course not limited only to the above described preferred embodiment but several embodiments are possible whithin the scope of the claims. Thus the measure device can be used for different measure purposes within sports, for example for measuring athletic performances such as long jump, javelin-throwing and so on. An other possible variety is the measuring of vertical distances. For instance when storing pallet loaded goods in so called height stock, i.e. very high shelves with assistance of fork trucks. The l.l~SS~O
collection of a pallet at high heights is a great problem, becau~e it is difficult to ~ee the exact position of the fork~ and the pallet. By fixing the gauging station according to the invention at the fork truck, and the free end of the measuring tape at the forks and the operating device at the driver ~ seat in the truck, it is po~sible by leaving the pallet on the shelf to measure the distance in que~tion, which value will be accumulated in the memory of the gauging ~tation. When the pallet will be collected the fork will be lifted up to the earlier mea~ured value.
The mea~uring tape 2 and with that the operating device 3 is then pulled out to the other, opposite end of the first mea-sure ob~ect, at which a marketing or a ledge 23 on the opera-55~LO
ting device 3 is adjusted in level with the end of the mea-sure object. It is now possible to immediately read the length of the measure object on the measure display 19, which best is arranged in the gauging station 1 in such a way that it easily can be read from the free end of the measuring tape 2. If the switch 15 is pushed in this position the measured length value is accumulated in the memory 22 connected to the summation unit 18 and is shown on the sum display 20. The operating device 3 is hereafter moved to the end of the next measure object, where the procedure is repeated. In this way alla measure object that have been piled up on the measure table 4 easily can be measured, at which all the length values automatically are added up and shown on the sum dis-play 20. The measure objects 5 does of course not need to be arranged at a measure table 4 but the invention can be used for measuring any separate measure objects. When all measure objects have been measured one can easily read the total length of the measured objects on the sum display 20.
By providing the gauging station 1 with an additional calculation circuit (not shown) and a key set 24 connected thereto it is for example possible that a standard price, as price per meter, for the respective article can be fed in,at which the gauging station 1 automatically calculates the cost for the measured articles. The thus calculated total price is shown on an additional display (not shown).
The device can also be provided with a number calculator which shows how many times the switch 15 has been pushed.
The invention is of course not limited only to the above described preferred embodiment but several embodiments are possible whithin the scope of the claims. Thus the measure device can be used for different measure purposes within sports, for example for measuring athletic performances such as long jump, javelin-throwing and so on. An other possible variety is the measuring of vertical distances. For instance when storing pallet loaded goods in so called height stock, i.e. very high shelves with assistance of fork trucks. The l.l~SS~O
collection of a pallet at high heights is a great problem, becau~e it is difficult to ~ee the exact position of the fork~ and the pallet. By fixing the gauging station according to the invention at the fork truck, and the free end of the measuring tape at the forks and the operating device at the driver ~ seat in the truck, it is po~sible by leaving the pallet on the shelf to measure the distance in que~tion, which value will be accumulated in the memory of the gauging ~tation. When the pallet will be collected the fork will be lifted up to the earlier mea~ured value.
Claims (3)
1. An electronic length measuring device for measuring length and summing successively measured lengths, said device comprising:
a gauging station;
an elongated measuring tape having a plurality of detectable elements secured thereto and spaced at equal distances along the length of the tape, said tape having a distal end;
means for permitting selective longitudinal extension and retraction of said distal end of said tape from said gauging station;
detector means for sensing passage of said detectable elements thereby during longitudinal extension and retraction of said tape;
counter means for counting each detectable element sensed by said detector means to provide a count representing a measured length;
selectively actuable signal transmission means disposed at said distal end of said tape;
means for transmitting signals from said transmission means to said gauging station; and memory means disposed at said gauging station for accumulating counts of said counter means representing successive measured lengths in response to a signal transmitted by said transmission means.
a gauging station;
an elongated measuring tape having a plurality of detectable elements secured thereto and spaced at equal distances along the length of the tape, said tape having a distal end;
means for permitting selective longitudinal extension and retraction of said distal end of said tape from said gauging station;
detector means for sensing passage of said detectable elements thereby during longitudinal extension and retraction of said tape;
counter means for counting each detectable element sensed by said detector means to provide a count representing a measured length;
selectively actuable signal transmission means disposed at said distal end of said tape;
means for transmitting signals from said transmission means to said gauging station; and memory means disposed at said gauging station for accumulating counts of said counter means representing successive measured lengths in response to a signal transmitted by said transmission means.
2. The device according to claim 1, wherein said signal transmission means includes manually actuable means for generating signals to be transmitted to said gauging station.
3. The device according to claim 2, wherein said means for transmitting comprises electric conductors secured to and extending lengthwise along said tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000373092A CA1145540A (en) | 1981-03-16 | 1981-03-16 | Electronic length measuring device comprising a measuring tape which is rolled up in a gauging station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000373092A CA1145540A (en) | 1981-03-16 | 1981-03-16 | Electronic length measuring device comprising a measuring tape which is rolled up in a gauging station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1145540A true CA1145540A (en) | 1983-05-03 |
Family
ID=4119457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000373092A Expired CA1145540A (en) | 1981-03-16 | 1981-03-16 | Electronic length measuring device comprising a measuring tape which is rolled up in a gauging station |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1145540A (en) |
-
1981
- 1981-03-16 CA CA000373092A patent/CA1145540A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |