CA1056777A - Laterally and longitudinally spaced tongue interlocks for web laminate - Google Patents
Laterally and longitudinally spaced tongue interlocks for web laminateInfo
- Publication number
- CA1056777A CA1056777A CA281,635A CA281635A CA1056777A CA 1056777 A CA1056777 A CA 1056777A CA 281635 A CA281635 A CA 281635A CA 1056777 A CA1056777 A CA 1056777A
- Authority
- CA
- Canada
- Prior art keywords
- tongues
- superimposed
- webs
- assembly
- feed
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42C—BOOKBINDING
- B42C3/00—Making booklets, pads, or form sets from multiple webs
Landscapes
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
- Replacement Of Web Rolls (AREA)
- Handling Of Sheets (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Continuous superimposed webs are interlocked together along opposite marginal edges by sets of superimposed tongues provided in the webs which interengage to effect an interlock. Each set includes at least a pair of superimposed tongues disposed along a line forming an angle with an adjacent marginal edge so that one of the tongues is staggered relative to the other in the direction of feed of the webs through a web processing machine. Thus, during separation of the plies in the direction of feed the forwardmost superimposed tongues are separated before the rearwardmost tongues thereby avoiding simultaneous separation of the tongues and decreas-ing the resistance offered by the tongues ply separation.
Continuous superimposed webs are interlocked together along opposite marginal edges by sets of superimposed tongues provided in the webs which interengage to effect an interlock. Each set includes at least a pair of superimposed tongues disposed along a line forming an angle with an adjacent marginal edge so that one of the tongues is staggered relative to the other in the direction of feed of the webs through a web processing machine. Thus, during separation of the plies in the direction of feed the forwardmost superimposed tongues are separated before the rearwardmost tongues thereby avoiding simultaneous separation of the tongues and decreas-ing the resistance offered by the tongues ply separation.
Description
~05677~7 This invention relates generally to interlocked continuous webs, and more particularly to the provision of sets of interengaging tongues staggered along at least a marginal edge of the webs for interlocking them together and for facilitating an easier separation of the plies.
For the purpose of releasably interlocking continuous superimposed webs together, interengaging superimposed tongues have been provided in such webs for preventing both longitudinal and transverse relative shifting of the webs while at the same time permitting the webs to be separated or peeled apart during decollating. Such tongues may be spaced along one or both marginal edges of the webs and are provided by p~nching or slitting through the webs to form substantially U-cuts forming tongues integrally attached to the webs and having free ends and side edges provided by the deviating slits.
The tongues may likewise be formed by substantially H-shaped cuts.
At each spaced location along the marginal edge or edges, one or more of such superimposed tongues may be provided depending on the holding strength required for the number of webs to be interlocked together. How-ever, where more than one of such superimposed tongues are present at each spaced location, they typically lie along a line perpendicular to their adjacent marginal edge. Consequently, when such webs are peeled apart during a web decd~lating operation, the interengaging tongues between webs at each location along the marginal edges unlock or disengage simultaneously as the webs of the assembly are decollated. Hence, the decollating operation is not smooth by reason of a "tug" or a "snag" experienced each time a set of the laterally disposed sets of tongues are peeled apart. In other words, the resistance offered by the two or more interengaging tongues at the spaced locations along the marginal edges is sufficiently great as to affect the smooth decollating operation of the webs.
In accordance with the present invention, there is provided an assembly of continuous webs, comprising, at least a pair of superimposed con-tinuous webs having spaced feed holes along at least one marginal edge thereof, 12 . reLe2 5 2 ~ /y ~ J ~ means~interlocking said webs together along at least said one marginal edge, ~' 105677~7 said means comprising sets of superimposed interengaging tongues spacedapart along said marginal edge, each set comprising at least first and second superimposed interengaging tongues with the interengaging tongues of each set offset both longitudinally and transversely from one another, said tongues being formed by cuts having legs lying parallel to said marginal edge, and each said tongue having a free end and an opposite end integral with its respective web, the sets of tongues and the superimposed tongues of each set being located sequentially in a direction of feed of the assembly through a web processing machine such that separation of said webs in the lQ direction of feed causes the tongues to disengage sequentially.
In the accompanying drawings which illustrate exemplary embodi-ments of the present invention:
Figure 1 is a top plan view of a continuous web assembly showing the spaced sets of interlocking tongues along opposite marginal edges, in accordance with the invention;
Figure 2 is a view similar to Figure 1 at an enlarged scale show-ing a part of the continuous web and the disposition of the interlocking webs of a pair of single sets in more detail;
Figures 3a, 3_ and 3c are sectional views taken substantially along line 3-3 of Figure 2 showing the sequential disengagement of the lock-ing tongues of a typical set during a web decollating operation; and Figure 4 is a sectional view similar to Figure 3 showing tongues formed by different cuts provided in the web assembly.
Turning now to the drawings wherein like reference characters refer to like and corresponding parts throughout the several views, a con-tinuous web assembly is generally designated 10 and comprises a plurality of superimposed webs 11 to 14 interlocked together by means of interengaging locking tongues 15 to 18 respectively provided in the overlying webs.
Spaced feed holes 19 are provided along opposite marginal edges of the web assembly for engaging correspondingly spaced feed pins of typical tractor feed devices provided for feeding the web assembly in a direction of the arrow shown in Figure 1 through a web processing machine. Of course, the feed holes may be provided along only one marginal edge for cooperation with a single feed device. And, each of the webs of assembly 10 is provided with superimposed transverse lines 21 of weakening for fan folding the assembly into a zigzag pack and for ultimately separating the assembly into individual units when burst along these transverse lines.
Sets generally designated 22 of locking tongues are equally spaced (see Figure 1) along both marginal edges of the assembly and, for convenience, these sets may be located between adjacent feed holes as shown.
me interengaging tongues of each set, as clearly shown in Figure 2, are transversely spaced from one another and are staggered in the direction of feed to form an echelon arrangement of the three locking tongues of each set. (The showing of three tongues per set is only exem-plary~ Two or four tongues per set may otherwise be provided.) Hence, interlocking tongues generally designated T of each set lie forwardly in the direction of feed of the web assembly relative to adjacent interlocking tongues generally designated Tl, and tongues Tl in turn lie forwardly of adjacent interlocking tongues generally designated T2. These tongues of a typical set are graphically illustrated in Figure 2 at opposite marginal edges of the assembly, and only the cuts forming the tongues are shown in the interest of clearly illustrating the particular disposition of tongues T, Tl and T2 of each set. Of course, the sets of tongues may be spaced along only one marginal edge of the assembly, if desiredO
A punch device of some standard design may be used in forming each of the tongues by providing superimposed U-cuts 23 from a side of the assembly so as to define tongues 15 to 18 having free leading ends 24 and trailing ends 25 integral with their respective webs. As clearly shown, the tongues of each set lie along lines L disposed at angles to their adja-cent marginal edges, with trailing ends 25 of tongues T lying laterally of leading ends 24 of tongues Tl. And, trailing ends 25 of tongues Tl lie laterally of leading ends 24 of tongues T20 It should be pointed out, however, that the adjacent tongues of each set may sligh~ly overlap, or that the adjacent tongues of each set may be slightly spaced from one another in the direction of feed so as to form slight gaps therebetweenO
Figures 3a, 3b and 3c illustrate the sequential unlocking of the tongues at T, Tl and T2 upon decollating or the peeling apart of web 11 as the assembly is moved in the direction of feed during a decollating operation. A detailed description of this operation will follow hereinafter.
Before decollating, all the tongues 15 to 18 at each of T, Tl 1~)567~r7 and T2 are respectively interengaged, as typically shown at Tl and T2 in Figure 3a, as they are deflected outwardly of one side of the web assem-bly through cuts 23 so as to interengage as well as to engage in the adja-cent apertures formed by the cuts so as to attach the webs relative to one another in the assembly. The particular formation of these tongues and the manner in which they serve to interlock superimposed webs together is by itself known in the art and is typically shown in United States Patent No.
For the purpose of releasably interlocking continuous superimposed webs together, interengaging superimposed tongues have been provided in such webs for preventing both longitudinal and transverse relative shifting of the webs while at the same time permitting the webs to be separated or peeled apart during decollating. Such tongues may be spaced along one or both marginal edges of the webs and are provided by p~nching or slitting through the webs to form substantially U-cuts forming tongues integrally attached to the webs and having free ends and side edges provided by the deviating slits.
The tongues may likewise be formed by substantially H-shaped cuts.
At each spaced location along the marginal edge or edges, one or more of such superimposed tongues may be provided depending on the holding strength required for the number of webs to be interlocked together. How-ever, where more than one of such superimposed tongues are present at each spaced location, they typically lie along a line perpendicular to their adjacent marginal edge. Consequently, when such webs are peeled apart during a web decd~lating operation, the interengaging tongues between webs at each location along the marginal edges unlock or disengage simultaneously as the webs of the assembly are decollated. Hence, the decollating operation is not smooth by reason of a "tug" or a "snag" experienced each time a set of the laterally disposed sets of tongues are peeled apart. In other words, the resistance offered by the two or more interengaging tongues at the spaced locations along the marginal edges is sufficiently great as to affect the smooth decollating operation of the webs.
In accordance with the present invention, there is provided an assembly of continuous webs, comprising, at least a pair of superimposed con-tinuous webs having spaced feed holes along at least one marginal edge thereof, 12 . reLe2 5 2 ~ /y ~ J ~ means~interlocking said webs together along at least said one marginal edge, ~' 105677~7 said means comprising sets of superimposed interengaging tongues spacedapart along said marginal edge, each set comprising at least first and second superimposed interengaging tongues with the interengaging tongues of each set offset both longitudinally and transversely from one another, said tongues being formed by cuts having legs lying parallel to said marginal edge, and each said tongue having a free end and an opposite end integral with its respective web, the sets of tongues and the superimposed tongues of each set being located sequentially in a direction of feed of the assembly through a web processing machine such that separation of said webs in the lQ direction of feed causes the tongues to disengage sequentially.
In the accompanying drawings which illustrate exemplary embodi-ments of the present invention:
Figure 1 is a top plan view of a continuous web assembly showing the spaced sets of interlocking tongues along opposite marginal edges, in accordance with the invention;
Figure 2 is a view similar to Figure 1 at an enlarged scale show-ing a part of the continuous web and the disposition of the interlocking webs of a pair of single sets in more detail;
Figures 3a, 3_ and 3c are sectional views taken substantially along line 3-3 of Figure 2 showing the sequential disengagement of the lock-ing tongues of a typical set during a web decollating operation; and Figure 4 is a sectional view similar to Figure 3 showing tongues formed by different cuts provided in the web assembly.
Turning now to the drawings wherein like reference characters refer to like and corresponding parts throughout the several views, a con-tinuous web assembly is generally designated 10 and comprises a plurality of superimposed webs 11 to 14 interlocked together by means of interengaging locking tongues 15 to 18 respectively provided in the overlying webs.
Spaced feed holes 19 are provided along opposite marginal edges of the web assembly for engaging correspondingly spaced feed pins of typical tractor feed devices provided for feeding the web assembly in a direction of the arrow shown in Figure 1 through a web processing machine. Of course, the feed holes may be provided along only one marginal edge for cooperation with a single feed device. And, each of the webs of assembly 10 is provided with superimposed transverse lines 21 of weakening for fan folding the assembly into a zigzag pack and for ultimately separating the assembly into individual units when burst along these transverse lines.
Sets generally designated 22 of locking tongues are equally spaced (see Figure 1) along both marginal edges of the assembly and, for convenience, these sets may be located between adjacent feed holes as shown.
me interengaging tongues of each set, as clearly shown in Figure 2, are transversely spaced from one another and are staggered in the direction of feed to form an echelon arrangement of the three locking tongues of each set. (The showing of three tongues per set is only exem-plary~ Two or four tongues per set may otherwise be provided.) Hence, interlocking tongues generally designated T of each set lie forwardly in the direction of feed of the web assembly relative to adjacent interlocking tongues generally designated Tl, and tongues Tl in turn lie forwardly of adjacent interlocking tongues generally designated T2. These tongues of a typical set are graphically illustrated in Figure 2 at opposite marginal edges of the assembly, and only the cuts forming the tongues are shown in the interest of clearly illustrating the particular disposition of tongues T, Tl and T2 of each set. Of course, the sets of tongues may be spaced along only one marginal edge of the assembly, if desiredO
A punch device of some standard design may be used in forming each of the tongues by providing superimposed U-cuts 23 from a side of the assembly so as to define tongues 15 to 18 having free leading ends 24 and trailing ends 25 integral with their respective webs. As clearly shown, the tongues of each set lie along lines L disposed at angles to their adja-cent marginal edges, with trailing ends 25 of tongues T lying laterally of leading ends 24 of tongues Tl. And, trailing ends 25 of tongues Tl lie laterally of leading ends 24 of tongues T20 It should be pointed out, however, that the adjacent tongues of each set may sligh~ly overlap, or that the adjacent tongues of each set may be slightly spaced from one another in the direction of feed so as to form slight gaps therebetweenO
Figures 3a, 3b and 3c illustrate the sequential unlocking of the tongues at T, Tl and T2 upon decollating or the peeling apart of web 11 as the assembly is moved in the direction of feed during a decollating operation. A detailed description of this operation will follow hereinafter.
Before decollating, all the tongues 15 to 18 at each of T, Tl 1~)567~r7 and T2 are respectively interengaged, as typically shown at Tl and T2 in Figure 3a, as they are deflected outwardly of one side of the web assem-bly through cuts 23 so as to interengage as well as to engage in the adja-cent apertures formed by the cuts so as to attach the webs relative to one another in the assembly. The particular formation of these tongues and the manner in which they serve to interlock superimposed webs together is by itself known in the art and is typically shown in United States Patent No.
2,246,065 issued June 17, 1941 to Ritzhaupt.
The arrangement of tongues T, Tl and T2 of each set 22 of ton-gues as aforedescribed is likewise typical for a plurality of tongues fewer or more than the three per set 22 illustrated in the present drawings. Hence, if only two tongues T and Tl per set are found necessary to releasably interlock superimposed webs together, they would be arranged along sloping lines L for each set. And, if four tongues per set are required for a given number of superimposed webs, they too would be arranged along sloping lines L for each set in an echelon fashion as shown in Figures 1 and 2.
The number of tongues T provided for each set is determined by the holding power needed for interlocking a predetermined number of webs together in the assembly.
Figures 3a, 3b and 3c illustrate various stages of web separa-tion during a web decollating operation. However, for the purpose of clarity only top web 11 is shown in the process of being separated or peeled apart from the remaining webs of the assembly. These remaining webs may be separated from one another at the time web 11 is separated, or they may be separated at some other stage of the decollating operation. Upon decoll-ating either manually or with the use of a decollator of any well known type, adjacent webs are moved further apart as the assembly is moved in the direction of the arrow shown in Figures 3a. A typical set 22 of tongues is shown in this Figure wherein tongues 15 of those shown at T near opposite marginal edges of the assembly disengage upon web separation while the remaining ton ~ s Tl and T2 remain interengaged momentarily. Upon further web separation tongues 15 at Tl are moved apart for disengagement as illus-trated in Figures 3b; and, upon still further web separation tongues 15 at T2 become separated as shown in Figure 3c. It can be therefore seen that single tongues of each set encountered during web separation are disengaged at opposite marginal edges of the web assembly, with the remaining tongues in such sets disengaging sequentially upon web separation. The "snags" or "tugs" normally experienced during tongue disengagement for those transverse-ly or laterally disposed tongues in each set as in the prior art are avoided with the present invention since tongues T disengage before tongues Tl which disengage before tongues T2 thereby each offering a disengaging resistance equal only to that of a single tongue during decollation. However~ the holding power created by the use of several tongues arranged in the form of an echelon is comparable to a like number of tongues arranged transversely of the web. A simple and smooth decollating operation is thereby assured with the present arrangement.
An alternative form of tongue formation is shown in Figure 4 where-in tongues 15a to 18a and 15b to 18b are formed by substantially H-shaped cuts made at one side of the assembly by a suitable punch device.
Obviously, many modifications and variations of the present inven-tion are made possible in the light of the above teachings. It is thereforeto be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.
The arrangement of tongues T, Tl and T2 of each set 22 of ton-gues as aforedescribed is likewise typical for a plurality of tongues fewer or more than the three per set 22 illustrated in the present drawings. Hence, if only two tongues T and Tl per set are found necessary to releasably interlock superimposed webs together, they would be arranged along sloping lines L for each set. And, if four tongues per set are required for a given number of superimposed webs, they too would be arranged along sloping lines L for each set in an echelon fashion as shown in Figures 1 and 2.
The number of tongues T provided for each set is determined by the holding power needed for interlocking a predetermined number of webs together in the assembly.
Figures 3a, 3b and 3c illustrate various stages of web separa-tion during a web decollating operation. However, for the purpose of clarity only top web 11 is shown in the process of being separated or peeled apart from the remaining webs of the assembly. These remaining webs may be separated from one another at the time web 11 is separated, or they may be separated at some other stage of the decollating operation. Upon decoll-ating either manually or with the use of a decollator of any well known type, adjacent webs are moved further apart as the assembly is moved in the direction of the arrow shown in Figures 3a. A typical set 22 of tongues is shown in this Figure wherein tongues 15 of those shown at T near opposite marginal edges of the assembly disengage upon web separation while the remaining ton ~ s Tl and T2 remain interengaged momentarily. Upon further web separation tongues 15 at Tl are moved apart for disengagement as illus-trated in Figures 3b; and, upon still further web separation tongues 15 at T2 become separated as shown in Figure 3c. It can be therefore seen that single tongues of each set encountered during web separation are disengaged at opposite marginal edges of the web assembly, with the remaining tongues in such sets disengaging sequentially upon web separation. The "snags" or "tugs" normally experienced during tongue disengagement for those transverse-ly or laterally disposed tongues in each set as in the prior art are avoided with the present invention since tongues T disengage before tongues Tl which disengage before tongues T2 thereby each offering a disengaging resistance equal only to that of a single tongue during decollation. However~ the holding power created by the use of several tongues arranged in the form of an echelon is comparable to a like number of tongues arranged transversely of the web. A simple and smooth decollating operation is thereby assured with the present arrangement.
An alternative form of tongue formation is shown in Figure 4 where-in tongues 15a to 18a and 15b to 18b are formed by substantially H-shaped cuts made at one side of the assembly by a suitable punch device.
Obviously, many modifications and variations of the present inven-tion are made possible in the light of the above teachings. It is thereforeto be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An assembly of continuous webs, comprising, at least a pair of superimposed continuous webs having spaced feed holes along at least one marginal edge thereof, means releasably interlocking said webs together along at least said one marginal edge, said means comprising sets of superimposed inter-engaging tongues spaced apart along said marginal edge, each set comprising at least first and second superimposed interengaging tongues with the inter-engaging tongues of each set offset both longitudinally and transversely from one another, said tongues being formed by cuts having legs lying parallel to said marginal edge, and each said tongue having a free end and an oppo-site end integral with its respective web, the sets of tongues and the superimposed tongues of each set being located sequentially in a direction of feed of the assembly through a web processing machine such that separation of said webs in the direction of feed causes the tongues to disengage sequentially.
2. The assembly according to claim 1, wherein each set further com-prises third and fourth superimposed interengaging tongues.
3. The assembly according to claim 1, wherein the opposite end of a leading one of said superimposed tongues is aligned transversely with the free end of an immediately following tongue of the same set.
4. The assembly according to claim 1, wherein said tongues are formed by substantially U-shaped cuts.
5. The assembly according to claim 1, wherein said tongues are formed by substantially H-shaped cuts.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76818977A | 1977-02-14 | 1977-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1056777A true CA1056777A (en) | 1979-06-19 |
Family
ID=25081806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA281,635A Expired CA1056777A (en) | 1977-02-14 | 1977-06-29 | Laterally and longitudinally spaced tongue interlocks for web laminate |
Country Status (17)
| Country | Link |
|---|---|
| AU (1) | AU3319578A (en) |
| BE (1) | BE863898A (en) |
| CA (1) | CA1056777A (en) |
| DE (1) | DE2806005A1 (en) |
| DK (1) | DK62378A (en) |
| ES (1) | ES467314A1 (en) |
| FI (1) | FI780373A (en) |
| FR (1) | FR2380207A1 (en) |
| GB (1) | GB1568200A (en) |
| GR (1) | GR64789B (en) |
| IT (1) | IT1103540B (en) |
| LU (1) | LU79011A1 (en) |
| NL (1) | NL7801110A (en) |
| NO (1) | NO780483L (en) |
| PT (1) | PT67603B (en) |
| SE (1) | SE7801265L (en) |
| ZA (1) | ZA78838B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6124015A (en) * | 1996-04-18 | 2000-09-26 | Jwi Ltd. | Multi-ply industrial fabric having integral jointing structures |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1006662A (en) * | 1962-04-03 | 1965-10-06 | Sis Ltd | Improvements in manifolding stationery |
| US3495852A (en) * | 1967-05-08 | 1970-02-17 | Standard Register Co | Forms fastening |
| FR2268645B1 (en) * | 1974-04-24 | 1983-01-14 | Schober Werkzeug & Maschbau |
-
1977
- 1977-06-29 CA CA281,635A patent/CA1056777A/en not_active Expired
-
1978
- 1978-01-31 NL NL7801110A patent/NL7801110A/en not_active Application Discontinuation
- 1978-02-01 PT PT67603A patent/PT67603B/en unknown
- 1978-02-02 SE SE7801265A patent/SE7801265L/en unknown
- 1978-02-06 FI FI780373A patent/FI780373A/en not_active Application Discontinuation
- 1978-02-07 LU LU79011A patent/LU79011A1/en unknown
- 1978-02-08 GB GB4992/78A patent/GB1568200A/en not_active Expired
- 1978-02-08 IT IT12465/78A patent/IT1103540B/en active
- 1978-02-10 DK DK62378A patent/DK62378A/en unknown
- 1978-02-10 AU AU33195/78A patent/AU3319578A/en active Pending
- 1978-02-13 DE DE19782806005 patent/DE2806005A1/en not_active Withdrawn
- 1978-02-13 NO NO780483A patent/NO780483L/en unknown
- 1978-02-13 GR GR55443A patent/GR64789B/en unknown
- 1978-02-13 BE BE185112A patent/BE863898A/en unknown
- 1978-02-13 FR FR7803963A patent/FR2380207A1/en not_active Withdrawn
- 1978-02-13 ZA ZA00780838A patent/ZA78838B/en unknown
- 1978-02-14 ES ES467314A patent/ES467314A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES467314A1 (en) | 1979-12-01 |
| GB1568200A (en) | 1980-05-29 |
| PT67603A (en) | 1978-03-01 |
| BE863898A (en) | 1978-05-29 |
| NL7801110A (en) | 1978-08-16 |
| IT7812465A0 (en) | 1978-02-08 |
| FR2380207A1 (en) | 1978-09-08 |
| SE7801265L (en) | 1978-08-15 |
| DK62378A (en) | 1978-08-15 |
| DE2806005A1 (en) | 1978-08-17 |
| IT1103540B (en) | 1985-10-14 |
| PT67603B (en) | 1979-07-13 |
| ZA78838B (en) | 1979-01-31 |
| NO780483L (en) | 1978-08-15 |
| AU3319578A (en) | 1979-08-16 |
| GR64789B (en) | 1980-06-02 |
| FI780373A (en) | 1978-08-15 |
| LU79011A1 (en) | 1978-06-21 |
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