US3883176A - Chair shell - Google Patents

Chair shell Download PDF

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Publication number
US3883176A
US3883176A US433103A US43310374A US3883176A US 3883176 A US3883176 A US 3883176A US 433103 A US433103 A US 433103A US 43310374 A US43310374 A US 43310374A US 3883176 A US3883176 A US 3883176A
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Prior art keywords
shell
connecting section
flanges
seat
seat portion
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Expired - Lifetime
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US433103A
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Philip Hugh Morton
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PEL Ltd
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PEL Ltd
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/12—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats with shell-shape seat and back-rest unit, e.g. having arm rests

Definitions

  • This invention relates to a chair shell of the kind comprising a one-piece moulding defining a seat portion and a backrest portion.
  • the shell is mounted upon a support structure to make the complete chair.
  • a one piece chair shell comprises a seat portion connected to a backrest portion by at least one integral connecting section which is vertically corrugated.
  • FIG. 1 is a perspective front view of a chair shell constructed in accordance with the invention
  • FIG. 2 is an underneath and rear perspective view of the shell
  • FIG. 3 is a cross section on the line 3-3 in FIG. 1;
  • FIG. 4 is an inverted plan view of the seat shell
  • FIG. 5 is a side elevation view.
  • the chair shell shown is intended to be mounted upon a supporting structure, to which it is connected by fastenings.
  • the shell has headed spigots 9 moulded into its base. These locate in respective apertures formed in lugs on a tubular metal underframe (not shown).
  • the means whereby the shell is attached to the underframe is described and claimed in British Pat. No. 1,086,071.
  • other types of fastening means may be substituted for the spigots shown.
  • the shell comprises a seat portion 10 and a backrest portion 11 which are shaped and positioned in relation to one another to provide comfort as well as a good seating posture.
  • the seat portion 10 is approximately rectangular, having integrally flanged edges.
  • the front edge has a shallow flange 12 joined to the slightly concave seat surface by a curved zone defining on the top surface, a convex surface 12 along the front of the seat.
  • the flanges 13 at the two sides taper in depth, the narrower end being towards the seat front.
  • These flanges 13 are also outwardly flared and join the seat surface with shallow raised lips which are visible in FIG. 1 at 14.
  • the flanges 13 continue to the rear of the seat portion 10, where they are of maximum depth.
  • the backrest portion 1 1 is also generally rectangular, though its front surface is substantially curved inwardly to the center.
  • the upper edge of the backrest portion 11 is provided with a shallow flanged edge 16 similar to that at the front of the seat portion 10.
  • the sides of the backrest portion are also provided with flanges 17 and, in similar manner to the seat portion 10, the flange depth is greater at the bottom of the backrest portion, the side flanges tapering uniformly. These flanges are furthermore continued along the lower edge of the backrest portion at 18, at which position their depth is a maximum.
  • the flanges 17, 18 are also outwardly flared or inclined.
  • the lower edge of the backrest portion 11 is of shallow V shape.
  • connecting section 19 This is vertically corrugated as shown in FIGS. 1, 3 and 4. It has generally convex contoured side flanges 20 bounded by a pair of ridges 21, between which is defined a concave recess 22.
  • the side flanges 20 join with the flanges 15 at the rear edge of the seat portion 10 and with the flanges 18 at the lower edge of the backrest portion 11, as can be seen from FIGS. 1, 2 and 5.
  • the central concave recess 22 extends over most of the length of the connecting section 19 but it merges into the respective surfaces of the seat portion 10 and of the backrest portion 11.
  • the ridges 21 merge with the lips 14 of the seat portion and with the edges of the backrest portion respectively.
  • the connecting section 19 is moreover, concave as viewed in side elevation and is set back behind the general plane of the surface of the backrest portion 11 of the chair shell. This can be seen in FIG. 5. Furthermore, the connecting section widens from its upper to its lower end, since the side flanges 20 are wider at their junction with the flanges 15 of the seat portion than they are at the corresponding junctions with the flanges 18 of the backrest portion 11.
  • integral webs 23 join the slightly concave or generally flat portion with the two flange continuations 15 at the rear edge and extend, in this example, in parallel relationship over approximately two thirds of the length of the seat portion.
  • the webs 23 are of the same depth at their rear ends as the flanges 15 which they join but taper to their front ends.
  • the shell is preferably made from a plastics material having some resilience. It is constructed by a moulding process.
  • One suitable material from which it may be made is polypropylene and another is resin bonded glass fiber.
  • the type of material and its thickness determine the strength and relative resilience of the shell. It is however desirable and is designed to provide great strength with a limited degree of resilience in the connecting section 19.
  • a one piece chair shell comprising a seat portion connected to a backrest portion by at least one connecting section which is vertically corrugated and which is substantially narrower than the seat portion and the backrest portion with the vertical corrugations facilitating support of the substantially narrower connecting section and the remainder of the chair shell.
  • connecting section is provided with side flanges and a central recess, the section being concave in side elevation.
  • the invention is accordance with claim 2 wherein the seat and backrest portions are flanged and the flanges merge with the connecting section thereby providing a continuous flange about the circumference of the shell 4.
  • the invention in accordance with claim 1 wherein the shell is of a molded plastics material.

Abstract

A one piece chair shell comprising a seat portion and a backrest portion connected by a vertically corrugated integral connecting section.

Description

" United States Patent Morton May 13, 1975 CHAIR SHELL [56] References Cited [75] Inventor: Philip Hugh Morton, Kidderminster, UNITED STATES PATENTS England 3,177,036 4/1965 Halter 297/454 3,319,999 5/1967 Lieberman et a1 297/457 [73] Assgnee' g i g wmcestershre 3,512,835 5/1970 Flototto 297/457 3,716,270 2/1973 Frazier 297/454 [22] Filed: Jan. 14, 1974 3,734,561 5/1973 Barecki et a1 297/457 [2]] Appl' 433103 Primary Examiner-Casmir A. Nunberg Attorney, Agent, or FirmKane, Dalsimer, Kane, [30] Foreign Application Priority Data Sullivan and uruCZ Jan. 23, 1973 United Kingdom 3389/73 [57] ABSTRACT [52] US. Cl 297/457; 297/454 A one piece chair She Comprising a Seat portion and [51] Int. Cl A47c 3/00; A47c 7/02 a backrest portion connected by a vertically comb [58] Fleld of Search ..'297/445, 451, 452, 454, gated integral connecting section 4 Claims, 5 Drawing Figures PATENTEU W 1 3 i975 SHEET P [1? 2 FIG-4.
CHAIR SHELL BACKGROUND OF THE INVENTION This invention relates to a chair shell of the kind comprising a one-piece moulding defining a seat portion and a backrest portion. The shell is mounted upon a support structure to make the complete chair.
SUMMARY OF THE INVENTION It is the object of the invention to provide a chair shell which provides a good seating posture commensurate with comfort.
According to the invention a one piece chair shell comprises a seat portion connected to a backrest portion by at least one integral connecting section which is vertically corrugated.
DESCRIPTION OF THE DRAWINGS The invention will now be described by way of example with reference to the accompanying drawings, in which:
FIG. 1 is a perspective front view of a chair shell constructed in accordance with the invention;
FIG. 2 is an underneath and rear perspective view of the shell;
FIG. 3 is a cross section on the line 3-3 in FIG. 1;
FIG. 4 is an inverted plan view of the seat shell, and
FIG. 5 is a side elevation view.
DESCRIPTION OF THE PREFERRED EMBODIMENT The chair shell shown is intended to be mounted upon a supporting structure, to which it is connected by fastenings. In this example the shell has headed spigots 9 moulded into its base. These locate in respective apertures formed in lugs on a tubular metal underframe (not shown). The means whereby the shell is attached to the underframe is described and claimed in British Pat. No. 1,086,071. However, other types of fastening means may be substituted for the spigots shown.
The shell comprises a seat portion 10 and a backrest portion 11 which are shaped and positioned in relation to one another to provide comfort as well as a good seating posture. The seat portion 10 is approximately rectangular, having integrally flanged edges. The front edge has a shallow flange 12 joined to the slightly concave seat surface by a curved zone defining on the top surface, a convex surface 12 along the front of the seat. The flanges 13 at the two sides taper in depth, the narrower end being towards the seat front. These flanges 13 are also outwardly flared and join the seat surface with shallow raised lips which are visible in FIG. 1 at 14. The flanges 13 continue to the rear of the seat portion 10, where they are of maximum depth. These continuations are indicated at 15.
The backrest portion 1 1 is also generally rectangular, though its front surface is substantially curved inwardly to the center. The upper edge of the backrest portion 11 is provided with a shallow flanged edge 16 similar to that at the front of the seat portion 10. The sides of the backrest portion are also provided with flanges 17 and, in similar manner to the seat portion 10, the flange depth is greater at the bottom of the backrest portion, the side flanges tapering uniformly. These flanges are furthermore continued along the lower edge of the backrest portion at 18, at which position their depth is a maximum. The flanges 17, 18 are also outwardly flared or inclined. The lower edge of the backrest portion 11 is of shallow V shape.
Connecting the seat and the backrest portions is a connecting section 19. This is vertically corrugated as shown in FIGS. 1, 3 and 4. It has generally convex contoured side flanges 20 bounded by a pair of ridges 21, between which is defined a concave recess 22. The side flanges 20 join with the flanges 15 at the rear edge of the seat portion 10 and with the flanges 18 at the lower edge of the backrest portion 11, as can be seen from FIGS. 1, 2 and 5.
The central concave recess 22 extends over most of the length of the connecting section 19 but it merges into the respective surfaces of the seat portion 10 and of the backrest portion 11. The ridges 21 merge with the lips 14 of the seat portion and with the edges of the backrest portion respectively.
The connecting section 19 is moreover, concave as viewed in side elevation and is set back behind the general plane of the surface of the backrest portion 11 of the chair shell. This can be seen in FIG. 5. Furthermore, the connecting section widens from its upper to its lower end, since the side flanges 20 are wider at their junction with the flanges 15 of the seat portion than they are at the corresponding junctions with the flanges 18 of the backrest portion 11.
On the underside of the seat portion 10 there are provided integral webs 23. These join the slightly concave or generally flat portion with the two flange continuations 15 at the rear edge and extend, in this example, in parallel relationship over approximately two thirds of the length of the seat portion. The webs 23 are of the same depth at their rear ends as the flanges 15 which they join but taper to their front ends.
The shell is preferably made from a plastics material having some resilience. It is constructed by a moulding process. One suitable material from which it may be made is polypropylene and another is resin bonded glass fiber. The type of material and its thickness determine the strength and relative resilience of the shell. It is however desirable and is designed to provide great strength with a limited degree of resilience in the connecting section 19.
Having thus described the invention, what is claimed 1. A one piece chair shell comprising a seat portion connected to a backrest portion by at least one connecting section which is vertically corrugated and which is substantially narrower than the seat portion and the backrest portion with the vertical corrugations facilitating support of the substantially narrower connecting section and the remainder of the chair shell.
2. The invention in accordance with claim 1 wherein the connecting section is provided with side flanges and a central recess, the section being concave in side elevation.
3. The invention is accordance with claim 2 wherein the seat and backrest portions are flanged and the flanges merge with the connecting section thereby providing a continuous flange about the circumference of the shell 4. The invention in accordance with claim 1 wherein the shell is of a molded plastics material.

Claims (4)

1. A one piece chair shell comprising a seat portion connected to a backrest portion by at least one connecting section which is vertically corrugated and which is substantially narrower than the seat portion and the backrest portion with the vertical corrugations facilitating support of the substantially narrower connecting section and the remainder of the chair shell.
2. The invention in accordance with claim 1 wherein the connecting section is provided with side flanges and a central recess, the section being concave in side elevation.
3. The invention is accordance with claim 2 wherein the seat and backrest portions are flanged and the flanges merge with the connecting section thereby providing a continuous flange about the circumference of the shell
4. The invention in accordance with claim 1 wherein the shell is of a molded plastics material.
US433103A 1973-01-23 1974-01-14 Chair shell Expired - Lifetime US3883176A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB338973A GB1447121A (en) 1973-01-23 1973-01-23 Chair shell

Publications (1)

Publication Number Publication Date
US3883176A true US3883176A (en) 1975-05-13

Family

ID=9757414

Family Applications (1)

Application Number Title Priority Date Filing Date
US433103A Expired - Lifetime US3883176A (en) 1973-01-23 1974-01-14 Chair shell

Country Status (16)

Country Link
US (1) US3883176A (en)
JP (1) JPS49110457A (en)
AT (1) AT325245B (en)
BE (1) BE809656A (en)
CH (1) CH563136A5 (en)
CY (1) CY902A (en)
DE (1) DE2402644C3 (en)
ES (1) ES220419Y (en)
FR (1) FR2214437B1 (en)
GB (1) GB1447121A (en)
HK (1) HK27777A (en)
IE (1) IE38720B1 (en)
NL (1) NL7400381A (en)
SE (1) SE393524B (en)
ZA (1) ZA74109B (en)
ZM (1) ZM874A1 (en)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032190A (en) * 1975-06-13 1977-06-28 Fehlbaum Ergonomically designed chair
US4047757A (en) * 1976-05-03 1977-09-13 Eames Loren W Seating structures with flexible backs
US4744603A (en) * 1986-04-10 1988-05-17 Steelcase Inc. Chair shell with selective back stiffening
US5076646A (en) * 1989-12-06 1991-12-31 Denis Matte One-piece shell for a chair
US5123702A (en) * 1990-10-24 1992-06-23 Shelby Williams Industries, Inc. Interaction-high density stacking chair
US5577811A (en) * 1995-06-07 1996-11-26 Hon Industries Inc. Ergonomic chair
WO1998008424A1 (en) * 1996-08-26 1998-03-05 Barry James Dixon Chair
US5810438A (en) * 1994-06-13 1998-09-22 Herman Miller, Inc. One piece molded seating structure
US6036266A (en) * 1997-01-23 2000-03-14 Lear Corporation Vehicle seat assembly incorporating a one-piece shell as seat back and lower seat support
US6185761B1 (en) * 1995-09-30 2001-02-13 Cane & Able Limited Apparatus for raising a person
US9560917B2 (en) 2014-11-26 2017-02-07 Steelcase Inc. Recline adjustment system for chair
USD802951S1 (en) 2016-04-12 2017-11-21 Steelcase Inc. Chair
USD804209S1 (en) 2016-04-12 2017-12-05 Steelcase Inc. Chair
USD804839S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD804840S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD804876S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD804875S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD804841S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD808187S1 (en) 2016-04-12 2018-01-23 Steelcase Inc. Seating shell
USD821793S1 (en) 2016-04-12 2018-07-03 Steelcase Inc. Seating shell
US10021984B2 (en) 2015-04-13 2018-07-17 Steelcase Inc. Seating arrangement
USD828050S1 (en) * 2016-04-04 2018-09-11 Kartell S.P.A. Chair
US10194750B2 (en) 2015-04-13 2019-02-05 Steelcase Inc. Seating arrangement
US10226393B1 (en) * 2014-10-23 2019-03-12 Lever Up, Inc. Method of and apparatus for assisting persons from a lying position to a sitting position and a sitting position to a lying position
US10427762B1 (en) * 2018-04-25 2019-10-01 Matthew Gregory Mosher Boat seat
US10966527B2 (en) 2017-06-09 2021-04-06 Steelcase Inc. Seating arrangement and method of construction
USD932203S1 (en) 2016-04-12 2021-10-05 Steelcase Inc. Seating arrangement
JP2021183191A (en) * 2013-11-29 2021-12-02 株式会社 Mtg Postural maintenance tool
US11253076B2 (en) 2019-02-05 2022-02-22 Unchair LLC Chair having open shoulder backrest
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US20220304470A1 (en) * 2020-02-06 2022-09-29 Baleun Gnb Co., Ltd. Functional chair
US11589678B2 (en) 2019-01-17 2023-02-28 Hni Technologies Inc. Chairs including flexible frames
US20240081542A1 (en) * 2022-09-08 2024-03-14 Anthro Form, Llc Chair having interchangeable decorative feature

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638076B1 (en) * 1989-03-01 1991-02-01 Grosfillex Sarl MONOLITHIC SEAT IN INJECTED PLASTIC MATERIAL
DE202009003927U1 (en) 2009-03-23 2009-06-10 Oranje Meubel B.V. Chair with locking means
LT2802241T (en) * 2011-11-09 2019-02-11 Loan Pham Thi Kim A comfortable orthopedic chair for prevention of spinal diseases

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177036A (en) * 1959-10-17 1965-04-06 Halter Ludwig Seat device
US3319999A (en) * 1961-10-23 1967-05-16 Fixtures Mfg Corp Chair construction
US3512835A (en) * 1968-04-22 1970-05-19 Floetotto Chair
US3716270A (en) * 1971-07-14 1973-02-13 Calcagni Frazier Zajchowski Ar Back support
US3734561A (en) * 1971-06-03 1973-05-22 American Seating Co Sled base frame chair

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3133765A (en) * 1962-08-30 1964-05-19 Ion Corp Chair

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177036A (en) * 1959-10-17 1965-04-06 Halter Ludwig Seat device
US3319999A (en) * 1961-10-23 1967-05-16 Fixtures Mfg Corp Chair construction
US3512835A (en) * 1968-04-22 1970-05-19 Floetotto Chair
US3734561A (en) * 1971-06-03 1973-05-22 American Seating Co Sled base frame chair
US3716270A (en) * 1971-07-14 1973-02-13 Calcagni Frazier Zajchowski Ar Back support

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032190A (en) * 1975-06-13 1977-06-28 Fehlbaum Ergonomically designed chair
US4047757A (en) * 1976-05-03 1977-09-13 Eames Loren W Seating structures with flexible backs
US5611598A (en) * 1986-04-10 1997-03-18 Steelcase Inc. Chair having back shell with selective stiffening
US4744603A (en) * 1986-04-10 1988-05-17 Steelcase Inc. Chair shell with selective back stiffening
US5076646A (en) * 1989-12-06 1991-12-31 Denis Matte One-piece shell for a chair
US5123702A (en) * 1990-10-24 1992-06-23 Shelby Williams Industries, Inc. Interaction-high density stacking chair
US5810438A (en) * 1994-06-13 1998-09-22 Herman Miller, Inc. One piece molded seating structure
US5577811A (en) * 1995-06-07 1996-11-26 Hon Industries Inc. Ergonomic chair
US6185761B1 (en) * 1995-09-30 2001-02-13 Cane & Able Limited Apparatus for raising a person
WO1998008424A1 (en) * 1996-08-26 1998-03-05 Barry James Dixon Chair
US6036266A (en) * 1997-01-23 2000-03-14 Lear Corporation Vehicle seat assembly incorporating a one-piece shell as seat back and lower seat support
JP2021183191A (en) * 2013-11-29 2021-12-02 株式会社 Mtg Postural maintenance tool
US10226393B1 (en) * 2014-10-23 2019-03-12 Lever Up, Inc. Method of and apparatus for assisting persons from a lying position to a sitting position and a sitting position to a lying position
US10813810B2 (en) * 2014-10-23 2020-10-27 Lever Up Method of and apparatus for assisting persons from a lying position to a sitting position and a sitting position to a lying position
US20200155397A1 (en) * 2014-10-23 2020-05-21 Lever Up Method of and apparatus for assisting persons from a lying position to a sitting position and a sitting position to a lying position
US9560917B2 (en) 2014-11-26 2017-02-07 Steelcase Inc. Recline adjustment system for chair
US11096497B2 (en) 2015-04-13 2021-08-24 Steelcase Inc. Seating arrangement
US11324325B2 (en) 2015-04-13 2022-05-10 Steelcase Inc. Seating arrangement
US11963621B2 (en) 2015-04-13 2024-04-23 Steelcase Inc. Seating arrangement
US11553797B2 (en) 2015-04-13 2023-01-17 Steelcase Inc. Seating arrangement
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US10021984B2 (en) 2015-04-13 2018-07-17 Steelcase Inc. Seating arrangement
US10575648B2 (en) 2015-04-13 2020-03-03 Steelcase Inc. Seating arrangement
US10194750B2 (en) 2015-04-13 2019-02-05 Steelcase Inc. Seating arrangement
USD828050S1 (en) * 2016-04-04 2018-09-11 Kartell S.P.A. Chair
USD802951S1 (en) 2016-04-12 2017-11-21 Steelcase Inc. Chair
USD804876S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD804841S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD804839S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD821793S1 (en) 2016-04-12 2018-07-03 Steelcase Inc. Seating shell
USD804209S1 (en) 2016-04-12 2017-12-05 Steelcase Inc. Chair
USD932203S1 (en) 2016-04-12 2021-10-05 Steelcase Inc. Seating arrangement
USD804875S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD804840S1 (en) 2016-04-12 2017-12-12 Steelcase Inc. Chair
USD808187S1 (en) 2016-04-12 2018-01-23 Steelcase Inc. Seating shell
US10966527B2 (en) 2017-06-09 2021-04-06 Steelcase Inc. Seating arrangement and method of construction
US11825955B2 (en) 2017-06-09 2023-11-28 Steelcase Inc. Seating arrangement and method of construction
US10427762B1 (en) * 2018-04-25 2019-10-01 Matthew Gregory Mosher Boat seat
US11589678B2 (en) 2019-01-17 2023-02-28 Hni Technologies Inc. Chairs including flexible frames
US11253076B2 (en) 2019-02-05 2022-02-22 Unchair LLC Chair having open shoulder backrest
US20220304470A1 (en) * 2020-02-06 2022-09-29 Baleun Gnb Co., Ltd. Functional chair
US20240081542A1 (en) * 2022-09-08 2024-03-14 Anthro Form, Llc Chair having interchangeable decorative feature

Also Published As

Publication number Publication date
IE38720B1 (en) 1978-05-24
GB1447121A (en) 1976-08-25
FR2214437A1 (en) 1974-08-19
ZA74109B (en) 1974-12-24
JPS49110457A (en) 1974-10-21
BE809656A (en) 1974-05-02
IE38720L (en) 1974-07-23
SE393524B (en) 1977-05-16
AT325245B (en) 1975-10-10
FR2214437B1 (en) 1976-11-26
CY902A (en) 1977-10-07
DE2402644B2 (en) 1979-06-28
HK27777A (en) 1977-06-10
ES220419U (en) 1976-10-01
DE2402644C3 (en) 1980-02-21
ZM874A1 (en) 1975-03-21
NL7400381A (en) 1974-07-25
ES220419Y (en) 1977-02-16
DE2402644A1 (en) 1974-07-25
AU6445174A (en) 1975-07-17
CH563136A5 (en) 1975-06-30

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