CA1052883A - Machine for identifying and counting coins or the like - Google Patents
Machine for identifying and counting coins or the likeInfo
- Publication number
- CA1052883A CA1052883A CA224,939A CA224939A CA1052883A CA 1052883 A CA1052883 A CA 1052883A CA 224939 A CA224939 A CA 224939A CA 1052883 A CA1052883 A CA 1052883A
- Authority
- CA
- Canada
- Prior art keywords
- coins
- cells
- coin
- counter
- identifying
- 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
Links
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
- G07D5/02—Testing the dimensions, e.g. thickness, diameter; Testing the deformation
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D3/00—Sorting a mixed bulk of coins into denominations
- G07D3/14—Apparatus driven under control of coin-sensing elements
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D9/00—Counting coins; Handling of coins not provided for in the other groups of this subclass
- G07D9/008—Feeding coins from bulk
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Coins (AREA)
- Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
Abstract
ABSTRACT
Mechanical coin sorting is known but it is slow and expensive, Also known are coin identifying devices using staggered photoelectric cells which respond to coins of different diameters but they are only suitable for de-tecting coins having comparatively large differences in diameter. Disclosed herein is an apparatus for identifying and counting coins which obviates these disadvantages. The apparatus comprises an optical signal transmitter controlling a counter. The signal transmitter is forward by an optico-electronic image converter past which the coins are guided and which supp-lies signals analogous to the respective coin surfaces, The signals are fed to a comparator which, in turn, feeds at least one counter with signals associated with the coins,
Mechanical coin sorting is known but it is slow and expensive, Also known are coin identifying devices using staggered photoelectric cells which respond to coins of different diameters but they are only suitable for de-tecting coins having comparatively large differences in diameter. Disclosed herein is an apparatus for identifying and counting coins which obviates these disadvantages. The apparatus comprises an optical signal transmitter controlling a counter. The signal transmitter is forward by an optico-electronic image converter past which the coins are guided and which supp-lies signals analogous to the respective coin surfaces, The signals are fed to a comparator which, in turn, feeds at least one counter with signals associated with the coins,
Description
105'~883 This invention relates to an apparatus for identifying and counting coins, coin-like tokens or the like, comprising at least one optical signal transmitter controlling a counter.
An apparatus of the aforementioned type is known, with which the coins are mechanically sorted before the counting operation proper. With this apparatus, the coins pass during the sorting operation past optical signal transmitters which are fonmed by photoelectric cell units and which count the number of the coins supplied by mechanical selection of certain coin containers. The known apparatus is not entirely satisfactory, since the expense for a mechanical sorting is not small and there are limits to the speed thereof. An additional factor is that a conversion of the apparatus from one type of coin to another is only possible at relatively high cost.
In addition, an apparatus for identifying coins is known, with which photoelectric cell units are used for detecting or identifying the coins themselves. In this case, a plurality of photoelectric cell units are so arranged in staggered relation that they respond to coins of different di-ameters (German Offenlegungsschrift 2,334,076.). Connected with this method of identification is the disadvantage that it is only suitable for detecting coins which have comparatively large differences in diameter. The reason for this is that there are limits to the concentration of the light beams of the separate photoelectric cell units and small differences in diameter cannot be detected in a satisfactory manner for technical measuring reasons.
An additional defect of this detecting and identifying apparatus is to be seen in the fact that only circular coins are in practice able to be sorted therewith and a distinction between coins having a central hole and those without a hole is only possible by using additional means.
The invention has for its object to provide an apparatus of the type initially referred to, with which it is possible by an optico-electronic method to effect a practically simultaneous sorting and counting of coins, coin-like tokens or the like of any arbitrary shape. This object is achieved lOS;~883 according to the invention by the signal transmitter being formed by an optico-electronic image converter~ past which coins are adapted to be guided and which supplies signals analogous to the respective coin surfaces, which signals are fed to at least one comparator which in its turn applies signals associated with the coins to at least one counter.
Thus, in accordance with the invention, there is provided apparatus for identifying and counting coins~ coin-like tokens comprising an optico-electronical signal transmitter past which the coins are adapted to be guided and which supplies signals corresponding to different sizes of the coins to at least one counter, characterized in that the optico-electronical signal transmitter is formed by an image converter consisting of two identical cells arranged side by side in the moving direction of the coins and abutting each other along an abut joint, which cells gauge the surface of the silhouette of the respective coins and supply signals analogous to that part of the surface measured by each of them to a summation unit and a zero-passage discriminator, which discriminator when equal voltages are reached at the outputs of the cells initiates the summation unit to at least one rating comparator which in its turn feeds the counter with the rating results.
Because of the surface-measuring method which is used with the apparatus according to the invention, the latter provides the advantage of a relatively great measurement accuracy by comparison with apparatus with which the cord or the diameter of the coins to be identified is measured. Coins having the same external diameter, with and without holes, can be distinguished from one another without any difficulty and it is also possible to detect non-circular coins. The counting of the coins does not presuppose any previous sorting and as a consequence it is quite possible to dispense with a sorting of the coins.
Additional advantages of the new apparatus consist in that, with ~wch apparatus7 no exact reference edges and adjusting devices associated
An apparatus of the aforementioned type is known, with which the coins are mechanically sorted before the counting operation proper. With this apparatus, the coins pass during the sorting operation past optical signal transmitters which are fonmed by photoelectric cell units and which count the number of the coins supplied by mechanical selection of certain coin containers. The known apparatus is not entirely satisfactory, since the expense for a mechanical sorting is not small and there are limits to the speed thereof. An additional factor is that a conversion of the apparatus from one type of coin to another is only possible at relatively high cost.
In addition, an apparatus for identifying coins is known, with which photoelectric cell units are used for detecting or identifying the coins themselves. In this case, a plurality of photoelectric cell units are so arranged in staggered relation that they respond to coins of different di-ameters (German Offenlegungsschrift 2,334,076.). Connected with this method of identification is the disadvantage that it is only suitable for detecting coins which have comparatively large differences in diameter. The reason for this is that there are limits to the concentration of the light beams of the separate photoelectric cell units and small differences in diameter cannot be detected in a satisfactory manner for technical measuring reasons.
An additional defect of this detecting and identifying apparatus is to be seen in the fact that only circular coins are in practice able to be sorted therewith and a distinction between coins having a central hole and those without a hole is only possible by using additional means.
The invention has for its object to provide an apparatus of the type initially referred to, with which it is possible by an optico-electronic method to effect a practically simultaneous sorting and counting of coins, coin-like tokens or the like of any arbitrary shape. This object is achieved lOS;~883 according to the invention by the signal transmitter being formed by an optico-electronic image converter~ past which coins are adapted to be guided and which supplies signals analogous to the respective coin surfaces, which signals are fed to at least one comparator which in its turn applies signals associated with the coins to at least one counter.
Thus, in accordance with the invention, there is provided apparatus for identifying and counting coins~ coin-like tokens comprising an optico-electronical signal transmitter past which the coins are adapted to be guided and which supplies signals corresponding to different sizes of the coins to at least one counter, characterized in that the optico-electronical signal transmitter is formed by an image converter consisting of two identical cells arranged side by side in the moving direction of the coins and abutting each other along an abut joint, which cells gauge the surface of the silhouette of the respective coins and supply signals analogous to that part of the surface measured by each of them to a summation unit and a zero-passage discriminator, which discriminator when equal voltages are reached at the outputs of the cells initiates the summation unit to at least one rating comparator which in its turn feeds the counter with the rating results.
Because of the surface-measuring method which is used with the apparatus according to the invention, the latter provides the advantage of a relatively great measurement accuracy by comparison with apparatus with which the cord or the diameter of the coins to be identified is measured. Coins having the same external diameter, with and without holes, can be distinguished from one another without any difficulty and it is also possible to detect non-circular coins. The counting of the coins does not presuppose any previous sorting and as a consequence it is quite possible to dispense with a sorting of the coins.
Additional advantages of the new apparatus consist in that, with ~wch apparatus7 no exact reference edges and adjusting devices associated
-2-lOSZ883 with the latter are required and that it can be very easily converted.
The invention is hereinafter more fully explained by reference to the accompanying drawing, wherein:
Figure 1 is a perspective view of an apparatus according to the invention, and Figure 2 shows the circuit diagram of the apparatus according to -2a-Figure 1. 105~883 In Figure 1, the reference 11 is the housing of the apparatus for identifying and counting coins 12, which are disposed in an unsorted state in a collecting trough 13. ~y means of a first conveyor belt 14, separate coins 12 are transferred from the collecting trough 13 to a coin-guiding rail 15, to which is connected a rocker member 16 for interrupting the guiding path for the coins. With the rocker member 16 disposed in the open position, the coins drop on to a second conveyor belt 17, which serves for the return of coins into the collecting trough 13. With the rocker member 16 closed, coins pass on to another coin-guiding rail 18, by which they are guided past an image converter 19, which consists of four solar cells 20.
Arranged opposite the image converter 19 is a light source 21, the rays of which are projected by a condenser 22 on to the solar cells 20 of the image converter 19. The light source 21 and condenser 22 have not been shown in their actual position in the drawing for reasons of clarity, but they have been shown in the manner of an exploded diagram outside the apparatus.
From the coin-guiding rail 18, the coin 12 respectively identified by the image converter 19 passes by way of an intermediate chute 23 into a distributor chute 24, which is pivotally mounted on the shaft 25 of a step-by-step mechanism 26 fonmed by a motor. Associated with the distributor chute 24 are coin passages 27, the ends 28 of which open above coin contain-ers 29. The reference 30 represents an electronic control means for counting coin values, for actuating the rocker member 16 and the step-by-step mech-ani~m 26, and also for supervising the satisfactory functioning of the apparatus. This control arrangement, the construction of which is more fully explained hereafter by reference to Figure 2, is provided with ref-erence level adjustment devices 31, by which it is possible for the apparatus to be adapted to different purposes.
As will be seen from Figure 2, the rocker member 16 is rotatably mounted by means of journals 32 in bearings 33. It has a projecting plate lOS'~883 34, which is held by a spring 35 in a rest position, in which the coins 12 are able to pass by the rocker member 16. Arranged at the front end of the coin-guiding rail 18 is a photoelectric cell unit 36, which delivers a sig-nal to an electronic store 37 when a coin 12 passes it, which signal acts upon a rocker magnet 38, which opens the rocker member 16 and holds it open until the counting operation in respect of a coin is completed.
When a coin 12 passes the image converter 19, there is first of all an increasing concealment of the solar cells 20d and (with larger coins) 20b by the shadow image of the coin. The covering of the solar cells re-sults in a decrease in the output voltage of a summation or adding unit 39.
If the value of the adding unit 39 is below a reference level which is ad-justable by an adjusting unit 40, a comparator 41 prepares for the advancing of an evaluation instruction. This advancing of the instruction takes place as soon as a zero-passage discriminator 42 passes from its L-position (L:
low level) into the H-position (H: high level). This is the case when the solar cells 20c and 20d (and also possibly 20a and 20b) are covered by equally large amounts. After delivery of the evaluation instruction, first of all the store 37 is returned to its initial position, so that the rocker magnet 38 can fall off and the rocker member 16 is brought back by the spring 35 into its bridging position. Secondly, by means of an eight-channel analogue comparator 43 and by way of a coder 44, a channel number is fed into an intermediate store 45, and in fact when and only when there is obtained voltage parity between the output voltage of the summation unit 39 and respectively a reference level adjusted by the reference level ad-justing unit 31. The reference levels correspond to the normal dimensions of the coins of a coinage system.
The channel numbers are supplied to a counter 46, which has a valuation stage, an adding mechanism 48, a store 49 and an indicating means S0.
In order to prevent counting of counterfeit coins, the apparatus is in addition equipped with a metal sensor 51, by means of which it is possible 105'~883 to separate out coins which are of the same size but are not of the pre-scribed metal. The response of the metal sensor 51, the actual position of which is indicated by the circuits Sl~, is stored in a store 52 with the delivery of a signal through the photoelectric cell unit 36 and thereafter is taken into account with the valuation of the coins in the valuation stage 47.
The mixture of coins counted by the counter 46 can thereafter be sorted in a sorting arrangement. For this purpose, the difference between a channel number which is stored in an intenmediate store 45 and the coun-ter content of a forward and backward counter 54 is determined in a compar-ator stage 53. Depending on the established difference, an advance instruc-tion is given to the control means 55 of the step-by-step mechanism 26 and the distributor chute 24 thereof is brought to above the respective coin channel 27.
The invention is hereinafter more fully explained by reference to the accompanying drawing, wherein:
Figure 1 is a perspective view of an apparatus according to the invention, and Figure 2 shows the circuit diagram of the apparatus according to -2a-Figure 1. 105~883 In Figure 1, the reference 11 is the housing of the apparatus for identifying and counting coins 12, which are disposed in an unsorted state in a collecting trough 13. ~y means of a first conveyor belt 14, separate coins 12 are transferred from the collecting trough 13 to a coin-guiding rail 15, to which is connected a rocker member 16 for interrupting the guiding path for the coins. With the rocker member 16 disposed in the open position, the coins drop on to a second conveyor belt 17, which serves for the return of coins into the collecting trough 13. With the rocker member 16 closed, coins pass on to another coin-guiding rail 18, by which they are guided past an image converter 19, which consists of four solar cells 20.
Arranged opposite the image converter 19 is a light source 21, the rays of which are projected by a condenser 22 on to the solar cells 20 of the image converter 19. The light source 21 and condenser 22 have not been shown in their actual position in the drawing for reasons of clarity, but they have been shown in the manner of an exploded diagram outside the apparatus.
From the coin-guiding rail 18, the coin 12 respectively identified by the image converter 19 passes by way of an intermediate chute 23 into a distributor chute 24, which is pivotally mounted on the shaft 25 of a step-by-step mechanism 26 fonmed by a motor. Associated with the distributor chute 24 are coin passages 27, the ends 28 of which open above coin contain-ers 29. The reference 30 represents an electronic control means for counting coin values, for actuating the rocker member 16 and the step-by-step mech-ani~m 26, and also for supervising the satisfactory functioning of the apparatus. This control arrangement, the construction of which is more fully explained hereafter by reference to Figure 2, is provided with ref-erence level adjustment devices 31, by which it is possible for the apparatus to be adapted to different purposes.
As will be seen from Figure 2, the rocker member 16 is rotatably mounted by means of journals 32 in bearings 33. It has a projecting plate lOS'~883 34, which is held by a spring 35 in a rest position, in which the coins 12 are able to pass by the rocker member 16. Arranged at the front end of the coin-guiding rail 18 is a photoelectric cell unit 36, which delivers a sig-nal to an electronic store 37 when a coin 12 passes it, which signal acts upon a rocker magnet 38, which opens the rocker member 16 and holds it open until the counting operation in respect of a coin is completed.
When a coin 12 passes the image converter 19, there is first of all an increasing concealment of the solar cells 20d and (with larger coins) 20b by the shadow image of the coin. The covering of the solar cells re-sults in a decrease in the output voltage of a summation or adding unit 39.
If the value of the adding unit 39 is below a reference level which is ad-justable by an adjusting unit 40, a comparator 41 prepares for the advancing of an evaluation instruction. This advancing of the instruction takes place as soon as a zero-passage discriminator 42 passes from its L-position (L:
low level) into the H-position (H: high level). This is the case when the solar cells 20c and 20d (and also possibly 20a and 20b) are covered by equally large amounts. After delivery of the evaluation instruction, first of all the store 37 is returned to its initial position, so that the rocker magnet 38 can fall off and the rocker member 16 is brought back by the spring 35 into its bridging position. Secondly, by means of an eight-channel analogue comparator 43 and by way of a coder 44, a channel number is fed into an intermediate store 45, and in fact when and only when there is obtained voltage parity between the output voltage of the summation unit 39 and respectively a reference level adjusted by the reference level ad-justing unit 31. The reference levels correspond to the normal dimensions of the coins of a coinage system.
The channel numbers are supplied to a counter 46, which has a valuation stage, an adding mechanism 48, a store 49 and an indicating means S0.
In order to prevent counting of counterfeit coins, the apparatus is in addition equipped with a metal sensor 51, by means of which it is possible 105'~883 to separate out coins which are of the same size but are not of the pre-scribed metal. The response of the metal sensor 51, the actual position of which is indicated by the circuits Sl~, is stored in a store 52 with the delivery of a signal through the photoelectric cell unit 36 and thereafter is taken into account with the valuation of the coins in the valuation stage 47.
The mixture of coins counted by the counter 46 can thereafter be sorted in a sorting arrangement. For this purpose, the difference between a channel number which is stored in an intenmediate store 45 and the coun-ter content of a forward and backward counter 54 is determined in a compar-ator stage 53. Depending on the established difference, an advance instruc-tion is given to the control means 55 of the step-by-step mechanism 26 and the distributor chute 24 thereof is brought to above the respective coin channel 27.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for identifying and counting coins, coin-like tokens comprising an optico-electronical signal transmitter past which the coins are adapted to be guided and which supplies signals corresponding to different sizes of the coins to at least one counter, characterized in that the optico-electronical signal transmitter is formed by an image converter consisting of two identical cells arranged side by side in the moving direction of the coins and abutting each other along an abut joint, which cells gauge the surface of the silhouette of the respective coins and supply signals analogous to that part of the surface measured by each of them to a summation unit and a zero-passage discriminator, which discriminator when equal voltages are reached at the outputs of the cells initiates the summation unit to at least one rat-ing comparator which in its turn feeds the counter with the rating results.
2. Apparatus according to claim 1, characterized therein that the rating comparator comprises several adjustable reference levels.
3. Apparatus according to claim 1, characterized therein that the two cells are combined in a stock pile manner with further pairs of cells, the cells of each side of the abut joint being connected in parallel.
4. Apparatus according to claim 1, characterized therein that the cells are formed by solar cells.
5. Apparatus according to claim 1 including an image converter with a linear characteristic.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742419597 DE2419597C3 (en) | 1974-04-19 | Device for identifying and counting coins or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1052883A true CA1052883A (en) | 1979-04-17 |
Family
ID=5913703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA224,939A Expired CA1052883A (en) | 1974-04-19 | 1975-04-18 | Machine for identifying and counting coins or the like |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS50147398A (en) |
| AT (1) | AT335204B (en) |
| AU (1) | AU498363B2 (en) |
| BR (1) | BR7502412A (en) |
| CA (1) | CA1052883A (en) |
| CH (1) | CH589330A5 (en) |
| DK (1) | DK167675A (en) |
| FR (1) | FR2268315A1 (en) |
| GB (1) | GB1486519A (en) |
| IT (1) | IT1032682B (en) |
| NL (1) | NL7504414A (en) |
| NO (1) | NO143290C (en) |
| SE (1) | SE397420B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4597091A (en) * | 1982-09-07 | 1986-06-24 | Blake David J | Pill counter |
| DE3321676C2 (en) * | 1983-06-13 | 1987-04-02 | Günter Dipl.-Ing. 1000 Berlin Iwersen | Device for identifying, counting and sorting coins or coin-like objects |
| GB2173624B (en) * | 1985-04-08 | 1988-12-14 | Qonaar Corp | Low power coin discrimination apparatus |
| CH667337A5 (en) * | 1985-06-21 | 1988-09-30 | Stoeckli Rudolf | COIN SORTING MACHINE. |
| IT1219063B (en) * | 1987-03-06 | 1990-04-24 | Azkoyen Ind Sa | COIN CLASSIFIER FOR COIN OPERATING MACHINES |
| FI81458C (en) * | 1987-03-31 | 1990-10-10 | Inter Marketing Oy | Device for identification of coins or the like |
| GB2229307B (en) * | 1989-03-17 | 1992-10-21 | Mars Inc | Device for guiding coins |
| GB2235324B (en) * | 1989-07-13 | 1993-08-18 | Mars Inc | Device for guiding coins |
| ES2036927B1 (en) * | 1991-08-08 | 1994-02-16 | Azkoyen Ind Sa | PROCEDURE TO DETECT THE OPERATION OF THE COIN RECOVERY MECHANISM IN COIN SELECTORS. |
| ES2037636A6 (en) * | 1992-03-24 | 1993-06-16 | Azkoyen Ind Sa | Device for obtaining the mechanical characteristics of coins. |
| ES2046119B1 (en) * | 1992-06-01 | 1994-10-16 | Azkoyen Ind Sa | PROCEDURE FOR THE VERIFICATION OF COINS. |
| ES2046128B1 (en) * | 1992-06-12 | 1994-10-01 | Azkoyen Ind Sa | COIN SELECTOR. |
| ES2046127B1 (en) * | 1992-06-12 | 1994-10-01 | Azkoyen Ind Sa | COIN SELECTOR. |
| GB2298072B (en) * | 1995-02-15 | 1998-08-05 | Starpoint Electrics Ltd | Distribution apparatus |
| US6142285A (en) * | 1996-05-21 | 2000-11-07 | Digitall Inc | Coin testing apparatus and method |
| US6069008A (en) * | 1998-11-25 | 2000-05-30 | Isis Pharmaceuticals Inc. | Antisense modulation of NF-kappa-B p65 subunit expression |
| CN106600814A (en) * | 2017-01-17 | 2017-04-26 | 广州大学 | Device for settling and packaging coins |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4728714U (en) * | 1971-04-24 | 1972-12-01 |
-
1975
- 1975-04-09 GB GB14551/75A patent/GB1486519A/en not_active Expired
- 1975-04-11 AT AT278375A patent/AT335204B/en not_active IP Right Cessation
- 1975-04-14 NL NL7504414A patent/NL7504414A/en not_active Application Discontinuation
- 1975-04-15 SE SE7504307A patent/SE397420B/en unknown
- 1975-04-16 IT IT67970/75A patent/IT1032682B/en active
- 1975-04-17 FR FR7511980A patent/FR2268315A1/fr not_active Withdrawn
- 1975-04-17 CH CH490575A patent/CH589330A5/xx not_active IP Right Cessation
- 1975-04-18 NO NO751396A patent/NO143290C/en unknown
- 1975-04-18 AU AU80324/75A patent/AU498363B2/en not_active Expired
- 1975-04-18 DK DK167675A patent/DK167675A/en not_active IP Right Cessation
- 1975-04-18 BR BR3066/75A patent/BR7502412A/en unknown
- 1975-04-18 CA CA224,939A patent/CA1052883A/en not_active Expired
- 1975-04-19 JP JP50048077A patent/JPS50147398A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2268315A1 (en) | 1975-11-14 |
| ATA278375A (en) | 1976-06-15 |
| SE397420B (en) | 1977-10-31 |
| JPS50147398A (en) | 1975-11-26 |
| BR7502412A (en) | 1976-03-09 |
| AU498363B2 (en) | 1979-03-08 |
| DE2419597B2 (en) | 1976-08-12 |
| IT1032682B (en) | 1979-06-20 |
| CH589330A5 (en) | 1977-06-30 |
| DE2419597A1 (en) | 1975-10-30 |
| NL7504414A (en) | 1975-10-21 |
| NO143290C (en) | 1981-01-07 |
| SE7504307L (en) | 1975-10-20 |
| GB1486519A (en) | 1977-09-21 |
| DK167675A (en) | 1975-10-20 |
| NO751396L (en) | 1975-10-21 |
| NO143290B (en) | 1980-09-29 |
| AT335204B (en) | 1977-02-25 |
| AU8032475A (en) | 1976-10-21 |
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