US3851754A - Stacked trays - Google Patents

Stacked trays Download PDF

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Publication number
US3851754A
US3851754A US00303345A US30334572A US3851754A US 3851754 A US3851754 A US 3851754A US 00303345 A US00303345 A US 00303345A US 30334572 A US30334572 A US 30334572A US 3851754 A US3851754 A US 3851754A
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Prior art keywords
tray
cover
groove
skirt
recesses
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Expired - Lifetime
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US00303345A
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R Jones
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Preci Spark Ltd
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Preci Spark Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D71/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans or pop bottles; Bales of material
    • B65D71/02—Arrangements of flexible binders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D21/00—Nestable, stackable or joinable containers; Containers of variable capacity

Definitions

  • a pack for transporting a plurahty of Individual meals ready for service comprises a number of interfitting [56] References Cited trays which are Stacked into a pack which can quickly be fastened together for Stable transport.
  • the subject of this invention is an arrangement which can be used to put up a plurality of separate meals in a unitary pack which is readily carried, conveniently stowable, and readily disassembled into component parts each carrying a separate meal.
  • each tray can be loaded with the elements of an individual meal, the loaded trays stacked one on another, the cover applied, the tie means fastened, so that the meals can be transported in a unitary pack and quickly distributed as and where required.
  • a facility of this nature can find a very wide range of uses.
  • a primary example is that of family or party picnicing, when the individual meals can be readily laid out prior to the departure for the picnic and be immediately available on arrival at the luncheon site, even in instances where the terrain might normally be awkward for the setting out of a meal.
  • other uses which are envisaged are for example in caravans, in hotels, on aircraft, in trains, coaches, boats or other means of transport, at conferences and so on.
  • each tray comprises a top surface with a depending skirt around the perimeter thereof, the junction between this perimeter and the skirt being rebated to interfit with the bottom edge of the skirt of the tray next above it, and locating means comprising lugs constituted by interruptions in said rebating for cooperation with corresponding locating recesses in the said bottom edge of the next tray.
  • the tie means may take various forms but in one useful arrangement comprise resilient binding cords with claw clips at the two ends thereof for engagement in said locating recesses in the lowest tray of the pack.
  • the layout of the individual trays can vary according to anticipated requirements, but in accordance with a further feature of the inven tion, one or more of these compartments will be provided with an upstanding rim to receive a sealing lid for the compartment concerned. This will not only help to isolate the compartments from one another, and hence keep the odours from passing between compartments, but will also provide a facility for conserving the particular thermal conditions of the contents, for example certain items may be kept warm even during transport, whilst in other cases it may be ice or other cooling means may be included in the compartment to keep the temperature low.
  • the cover will of course, preferably follow the outline shape of the individual trays and can have interfitting means corresponding to those on the latter.
  • it will be provided with a carrier handle, and this will advantageously be so devised as not to project beyond the flush surfaces of the pack, and interfere with the stackability of the latter.
  • the cover may be provided with a central recess and have a handle of bar form spanning this recess and flush with the upper surface of the cover.
  • FIG. 1 is a front view showing the pack assembled and tied
  • FIG. 2 is an exploded perspective illustration of the upper part of the pack illustrated in FIG. 1, and
  • FIG. 3 is a vertical cross section through the assembled pack.
  • the individual trays of the pack have been designated 1, the cover 2, the carrying handle 3 and the binding cords 4.
  • each tray 1 is of hollow form comprising a main rectangular surface 5 with a depending perimetrical skirt 6. It may be made of a synthetic plastics material, for example polypropylene or hard polyethene, by injection moulding or a vacuum forming method.
  • main rectangular recess 7 which can accommodate individual dishes, packages, and so on (not shown), depending on the purpose or function for which the pack is being used at any time.
  • a smaller circular recess 8 which again can be used for various purposes, for example to hold a liquid container.
  • a third elongated recess 9 in the tray may be used to house other items, for example plastic cutlery. It will be noted that recesses 7 and 8 have upstanding rims 10, I1 and that corresponding detachable covers 12, 13 may be arranged as a snap sealing fit on these rims for the purpose indicated above.
  • each tray 1 is provided with a rounded perimetrical rebate, or groove, 14 which is interrupted at the front and rear sides of the tray to form lugs 15.
  • a rounded perimetrical rebate, or groove, 14 which is interrupted at the front and rear sides of the tray to form lugs 15.
  • the cover 2 is of a shape conforming to that of the trays, and the skirt 17 thereof is provided with recesses 16 for engagement with the lugs 15 of the topmost of the assembled trays.
  • the upper surface of this cover 2 is formed with a central recess 18 and themselves spanned by the carrying handle 3.
  • this handle 3 comprises a channel-form moulding with enlarged ends 19 which are received in corresponding recesses 20 in the cover so that the surface of the handle, when assembled, lies flush with the upper surface of cover 2 (see FIG. 3).
  • the enlarged ends 19 of the handle are themselves provided with separable caps 21 which serve to trap and fasten the tie cords 4 of the pack which are received in these ends 19.
  • the handle, and the caps 21 are held fastened and assembled by fastening nut and bolt arrangements designated 22.
  • the cords are of strong woven elastic and are provided at their ends with quick fastening claws 23 which engage with recesses 16 in the bottom most tray of the pack. This form of tying of the trays enables the number of those used in the pack to be varied to suit a particular occasion.
  • each tray comprising a top with a depending skirt around the perimeter thereof, a groove formed at the junction between the top and the skirt and extending about the perimeter of the tray, said groove interfitting with the bottom edge of an identically shaped skirt of the tray next above it in the stack, each tray having at least two locating recesses in the bottom edge of the skirt and at least two raised lugs formed by interruptions in said groove and extending upwardly from the plane of the bottom of the groove, the lugs being shaped to mate with and positioned along the groove to fit snugly into said recesses of an identically shaped skirt of the tray next above it in the stack, and recessed compartments formed into said top,
  • a cover disposed above the uppermost tray, said cover including a said depending skirt with recesses interfitting with the groove and the lugs of the uppermost tray, respectively, a handle attached to the cover, and a quick release tie means about all of the trays and the cover for holding the assembly together as a unitary pack.
  • tie means comprise resilient binding cords with claw clips at the two ends thereof engaging said locating recesses in the lowest tray of the assembly 3.
  • at least one of the recessed compartments of each tray is provided with an upstanding rim to receive a sealing lid for the compartment concerned 4.
  • the cover is centrally recessed and has a bar handle spanning this recess and flush with the upper surface of the COVCl'.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Stackable Containers (AREA)
  • Package Frames And Binding Bands (AREA)

Abstract

A pack for transporting a plurality of individual meals ready for service comprises a number of interfitting trays which are stacked into a pack which can quickly be fastened together for stable transport.

Description

UNITED STATES PATENTS 1,582,338 4/1926 Lopez et a1 206/4 Unite States ate 1 1191 [11] 3,851,754
Jones 1 1 Dec. 3, 1974 1 STACKED TRAYS 1,863,793 6/1932 Hermani 220/94 A x 2,595,113 4/1952 Taberer 206 4 x [75] Inventor! Ralph GOdfreY Jones Markfield, 2,908,382 10/1959 Turner 206/72 x England I 2,923,512 2/1960 Campbell 206/65 B x 3,240,610 3/1966 Cease 220/23.6 x [73'] Asslgnee' g Sgark Syston 3,250,434 5/1966 Howlett 220 94 A an 3,744,663 7/1973 Moren 206 4 D [22] 1972 FOREIGN PATENTS OR APPLICATIONS pp 303,345 1,456,917 9/1966 France 229/1310. 11 662,824 12/1951 Great Britain... 206/4 224,413 11/1924 Great Britain 206/4 [30] Fme'gn Appllcatlm Pmmy Data 119,050 6/1947 Sweden 206 4 Feb. 4, 1972 Great Britain 5263 72 Primary Examiner-William I. Price [32] US. Cl 206/549, 206/509. 220/4 D, ASS/5mm Examiner Steven E Lipman 220/94 A Attorney, A em, or Firm-Larson, Taylor and Hinds g [51] Int. Cl. A45c 11/20, 865d 21/02 [58] Field of Search 206/4, 46 FC, 65 B, 72;
220/4 C, 4 D, 23.6, 94 R, 94 A, 94 B, 97 R, [57] ABSTRACT 97 B; 229/116 1 l A pack for transporting a plurahty of Individual meals ready for service comprises a number of interfitting [56] References Cited trays which are Stacked into a pack which can quickly be fastened together for Stable transport.
4 Claims, 3 Drawing Figures PATENTEL DEC 31974 SHEET 2 UP 3 PATENTEU DEC 97 SHEET 3 or 3 STACKED TRAYS The subject of this invention is an arrangement which can be used to put up a plurality of separate meals in a unitary pack which is readily carried, conveniently stowable, and readily disassembled into component parts each carrying a separate meal.
To this end it comprises a plurality of stackable, interfitting trays each formed with recessed compartments to receive foodstuffs, cutlery, drinking vessels, or other amenities, and a cover which is placed on and interfits with the topmost tray and has attached to it a handle and quick-release tie means to retain the pack of trays and cover assembled.
Thus, in use, each tray can be loaded with the elements of an individual meal, the loaded trays stacked one on another, the cover applied, the tie means fastened, so that the meals can be transported in a unitary pack and quickly distributed as and where required.
A facility of this nature can find a very wide range of uses. A primary example is that of family or party picnicing, when the individual meals can be readily laid out prior to the departure for the picnic and be immediately available on arrival at the luncheon site, even in instances where the terrain might normally be awkward for the setting out of a meal. Again, other uses which are envisaged are for example in caravans, in hotels, on aircraft, in trains, coaches, boats or other means of transport, at conferences and so on.
In one advantageous form each tray comprises a top surface with a depending skirt around the perimeter thereof, the junction between this perimeter and the skirt being rebated to interfit with the bottom edge of the skirt of the tray next above it, and locating means comprising lugs constituted by interruptions in said rebating for cooperation with corresponding locating recesses in the said bottom edge of the next tray. This provides for a neat compact and stable pack which can be readily handled without disturbing its assembly and contents.
The tie means may take various forms but in one useful arrangement comprise resilient binding cords with claw clips at the two ends thereof for engagement in said locating recesses in the lowest tray of the pack.
As will be appreciated the layout of the individual trays can vary according to anticipated requirements, but in accordance with a further feature of the inven tion, one or more of these compartments will be provided with an upstanding rim to receive a sealing lid for the compartment concerned. This will not only help to isolate the compartments from one another, and hence keep the odours from passing between compartments, but will also provide a facility for conserving the particular thermal conditions of the contents, for example certain items may be kept warm even during transport, whilst in other cases it may be ice or other cooling means may be included in the compartment to keep the temperature low.
The cover will of course, preferably follow the outline shape of the individual trays and can have interfitting means corresponding to those on the latter. In addition it will be provided with a carrier handle, and this will advantageously be so devised as not to project beyond the flush surfaces of the pack, and interfere with the stackability of the latter. For this reason the cover may be provided with a central recess and have a handle of bar form spanning this recess and flush with the upper surface of the cover.
A specific form of amenity pack according to the invention will now be described with reference to the accompanying drawings in which:
FIG. 1 is a front view showing the pack assembled and tied;
FIG. 2 is an exploded perspective illustration of the upper part of the pack illustrated in FIG. 1, and
FIG. 3 is a vertical cross section through the assembled pack.
Referring to the drawings, the individual trays of the pack have been designated 1, the cover 2, the carrying handle 3 and the binding cords 4.
Referring now to FIGS. 2 and 3 it will be observed that each tray 1 is of hollow form comprising a main rectangular surface 5 with a depending perimetrical skirt 6. It may be made ofa synthetic plastics material, for example polypropylene or hard polyethene, by injection moulding or a vacuum forming method.
In the particular instance illustrated it has a main rectangular recess 7 which can accommodate individual dishes, packages, and so on (not shown), depending on the purpose or function for which the pack is being used at any time. In addition it has a smaller circular recess 8 which again can be used for various purposes, for example to hold a liquid container. A third elongated recess 9 in the tray may be used to house other items, for example plastic cutlery. It will be noted that recesses 7 and 8 have upstanding rims 10, I1 and that corresponding detachable covers 12, 13 may be arranged as a snap sealing fit on these rims for the purpose indicated above.
It will further be observed that the top 5 of each tray 1 is provided witha rounded perimetrical rebate, or groove, 14 which is interrupted at the front and rear sides of the tray to form lugs 15. When the pack is assembled the bottom edge of the skirt 6 of a tray will seat on the rebate 14 of the tray next below it, and the lugs 15 on this latter tray will mate with corresponding recesses 16 provided in the skirt 6 of the firstmentioned tray. This will serve to locate the assembled trays against any relative movement.
The cover 2 is of a shape conforming to that of the trays, and the skirt 17 thereof is provided with recesses 16 for engagement with the lugs 15 of the topmost of the assembled trays. The upper surface of this cover 2 is formed with a central recess 18 and themselves spanned by the carrying handle 3. As will be particularly observed from FIGS. 2 and 3, this handle 3 comprises a channel-form moulding with enlarged ends 19 which are received in corresponding recesses 20 in the cover so that the surface of the handle, when assembled, lies flush with the upper surface of cover 2 (see FIG. 3). The enlarged ends 19 of the handle are themselves provided with separable caps 21 which serve to trap and fasten the tie cords 4 of the pack which are received in these ends 19. The handle, and the caps 21 are held fastened and assembled by fastening nut and bolt arrangements designated 22.
The cords are of strong woven elastic and are provided at their ends with quick fastening claws 23 which engage with recesses 16 in the bottom most tray of the pack. This form of tying of the trays enables the number of those used in the pack to be varied to suit a particular occasion.
I claim:
1. An assembly of stacked interfitting trays, each tray comprising a top with a depending skirt around the perimeter thereof, a groove formed at the junction between the top and the skirt and extending about the perimeter of the tray, said groove interfitting with the bottom edge of an identically shaped skirt of the tray next above it in the stack, each tray having at least two locating recesses in the bottom edge of the skirt and at least two raised lugs formed by interruptions in said groove and extending upwardly from the plane of the bottom of the groove, the lugs being shaped to mate with and positioned along the groove to fit snugly into said recesses of an identically shaped skirt of the tray next above it in the stack, and recessed compartments formed into said top,
and further including,
a cover disposed above the uppermost tray, said cover including a said depending skirt with recesses interfitting with the groove and the lugs of the uppermost tray, respectively, a handle attached to the cover, and a quick release tie means about all of the trays and the cover for holding the assembly together as a unitary pack.
2. An assembly according to claim 1, in which the tie means comprise resilient binding cords with claw clips at the two ends thereof engaging said locating recesses in the lowest tray of the assembly 3. An assembly according to claim 1, in which at least one of the recessed compartments of each tray is provided with an upstanding rim to receive a sealing lid for the compartment concerned 4. An assembly according to claim 1, in which the cover is centrally recessed and has a bar handle spanning this recess and flush with the upper surface of the COVCl'.

Claims (4)

1. An assembly of stacked interfitting trays, each tray comprising a top with a depending skirt around the perimeter thereof, a groove formed at the junction between the top and the skirt and extending about the perimeter of the tray, said groove interFitting with the bottom edge of an identically shaped skirt of the tray next above it in the stack, each tray having at least two locating recesses in the bottom edge of the skirt and at least two raised lugs formed by interruptions in said groove and extending upwardly from the plane of the bottom of the groove, the lugs being shaped to mate with and positioned along the groove to fit snugly into said recesses of an identically shaped skirt of the tray next above it in the stack, and recessed compartments formed into said top, and further including, a cover disposed above the uppermost tray, said cover including a said depending skirt with recesses interfitting with the groove and the lugs of the uppermost tray, respectively, a handle attached to the cover, and a quick release tie means about all of the trays and the cover for holding the assembly together as a unitary pack.
2. An assembly according to claim 1, in which the tie means comprise resilient binding cords with claw clips at the two ends thereof engaging said locating recesses in the lowest tray of the assembly.
3. An assembly according to claim 1, in which at least one of the recessed compartments of each tray is provided with an upstanding rim to receive a sealing lid for the compartment concerned.
4. An assembly according to claim 1, in which the cover is centrally recessed and has a bar handle spanning this recess and flush with the upper surface of the cover.
US00303345A 1972-02-04 1972-11-03 Stacked trays Expired - Lifetime US3851754A (en)

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JP (1) JPS4887963A (en)
BE (1) BE791315A (en)
CA (1) CA971521A (en)
CH (1) CH538849A (en)
FR (1) FR2171058B3 (en)
GB (1) GB1345684A (en)
IT (1) IT978491B (en)
ZA (1) ZA727584B (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082208A (en) * 1976-08-30 1978-04-04 Lane Jr Gordon Brandon Modular chest back pack
US4095533A (en) * 1977-04-15 1978-06-20 Jean Claude Leveille Trays combinable into an assembly
USD276116S (en) 1982-06-10 1984-10-30 Basil Mario E Compartmented tray and cover for food or the like
USD293624S (en) 1984-03-26 1988-01-12 Sherman Robert A Optical case
USD323616S (en) 1989-06-01 1992-02-04 Aladdin Synergetics, Inc. Combined food storage and serving tray with cover
USD334513S (en) 1992-08-04 1993-04-06 Aladdin Synergetics, Inc. Cover
USD335797S (en) 1992-07-08 1993-05-25 Aladdin Synergetics, Inc. Tray
USD335796S (en) 1990-01-29 1993-05-25 Aladdin Synergetics, Inc. Food serving tray
USD336592S (en) 1989-08-15 1993-06-22 Aladdin Synergetics, Inc. Tray top for a food service tray
US5501338A (en) * 1994-02-18 1996-03-26 Preston; Paul E. Food carrier system
GB2481410A (en) * 2010-06-22 2011-12-28 Border Biscuits Ltd Food packaging with a recessed surface connecting to side walls top edges
USD709592S1 (en) * 2013-02-07 2014-07-22 Camelbak Products, Llc Filter housing for a water filtration pitcher
US9743728B1 (en) * 2015-02-25 2017-08-29 Bruce McConnell Suitcase travel organizer
EP3793915A4 (en) * 2018-05-18 2022-01-26 Waddington North America, Inc. STACKABLE CONTAINERS WITH SUPPORT STRIP

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566750A (en) * 1969-03-10 1971-03-02 Foxboro Co Differential pressure cell with keystone structure

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB224413A (en) * 1924-01-17 1924-11-13 Tindaro Tarchi Improvements in or relating to portable canteens or mess kits
US1582338A (en) * 1924-09-08 1926-04-27 Lopez Julius Perez Dinner pail
US1863793A (en) * 1931-05-09 1932-06-21 Tin Decorating Company Of Balt Provision safe
GB662824A (en) * 1949-07-27 1951-12-12 Grace Ellis Improvements in or relating to container units comprising a plurality of separable receptacles
US2595113A (en) * 1948-01-20 1952-04-29 John H Taberer Sectional container
US2908382A (en) * 1957-12-05 1959-10-13 American Telephone & Telegraph Display carrying unit for color telephone sets
US2923512A (en) * 1957-01-17 1960-02-02 Elwin B Campbell Loading pallet board
US3240610A (en) * 1962-08-30 1966-03-15 Cease Central Inc Food package and method of packaging and serving the same
US3250434A (en) * 1964-07-06 1966-05-10 Dunlop Rubber Australia Ltd Electrolyte container for dry charge batteries
FR1456917A (en) * 1965-09-17 1966-07-08 Cartonnerie De Kaysersberg Fruit platter and the like
US3744663A (en) * 1969-08-21 1973-07-10 Plastofilm Inc Three component package having at least two components formed of vacuum molded plastic film

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB224413A (en) * 1924-01-17 1924-11-13 Tindaro Tarchi Improvements in or relating to portable canteens or mess kits
US1582338A (en) * 1924-09-08 1926-04-27 Lopez Julius Perez Dinner pail
US1863793A (en) * 1931-05-09 1932-06-21 Tin Decorating Company Of Balt Provision safe
US2595113A (en) * 1948-01-20 1952-04-29 John H Taberer Sectional container
GB662824A (en) * 1949-07-27 1951-12-12 Grace Ellis Improvements in or relating to container units comprising a plurality of separable receptacles
US2923512A (en) * 1957-01-17 1960-02-02 Elwin B Campbell Loading pallet board
US2908382A (en) * 1957-12-05 1959-10-13 American Telephone & Telegraph Display carrying unit for color telephone sets
US3240610A (en) * 1962-08-30 1966-03-15 Cease Central Inc Food package and method of packaging and serving the same
US3250434A (en) * 1964-07-06 1966-05-10 Dunlop Rubber Australia Ltd Electrolyte container for dry charge batteries
FR1456917A (en) * 1965-09-17 1966-07-08 Cartonnerie De Kaysersberg Fruit platter and the like
US3744663A (en) * 1969-08-21 1973-07-10 Plastofilm Inc Three component package having at least two components formed of vacuum molded plastic film

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082208A (en) * 1976-08-30 1978-04-04 Lane Jr Gordon Brandon Modular chest back pack
US4095533A (en) * 1977-04-15 1978-06-20 Jean Claude Leveille Trays combinable into an assembly
USD276116S (en) 1982-06-10 1984-10-30 Basil Mario E Compartmented tray and cover for food or the like
USD293624S (en) 1984-03-26 1988-01-12 Sherman Robert A Optical case
USD323616S (en) 1989-06-01 1992-02-04 Aladdin Synergetics, Inc. Combined food storage and serving tray with cover
USD336592S (en) 1989-08-15 1993-06-22 Aladdin Synergetics, Inc. Tray top for a food service tray
USD335796S (en) 1990-01-29 1993-05-25 Aladdin Synergetics, Inc. Food serving tray
USD335797S (en) 1992-07-08 1993-05-25 Aladdin Synergetics, Inc. Tray
USD334513S (en) 1992-08-04 1993-04-06 Aladdin Synergetics, Inc. Cover
US5501338A (en) * 1994-02-18 1996-03-26 Preston; Paul E. Food carrier system
GB2481410A (en) * 2010-06-22 2011-12-28 Border Biscuits Ltd Food packaging with a recessed surface connecting to side walls top edges
USD709592S1 (en) * 2013-02-07 2014-07-22 Camelbak Products, Llc Filter housing for a water filtration pitcher
US9743728B1 (en) * 2015-02-25 2017-08-29 Bruce McConnell Suitcase travel organizer
EP3793915A4 (en) * 2018-05-18 2022-01-26 Waddington North America, Inc. STACKABLE CONTAINERS WITH SUPPORT STRIP
US11794972B2 (en) 2018-05-18 2023-10-24 Waddington North America, Inc. Stackable containers with support band

Also Published As

Publication number Publication date
CH538849A (en) 1973-07-15
FR2171058B3 (en) 1975-11-28
JPS4887963A (en) 1973-11-19
IT978491B (en) 1974-09-20
ZA727584B (en) 1973-06-27
BE791315A (en) 1973-03-01
CA971521A (en) 1975-07-22
FR2171058A1 (en) 1973-09-21
GB1345684A (en) 1974-01-30

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