US2121171A - Barrel fastening means - Google Patents

Barrel fastening means Download PDF

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Publication number
US2121171A
US2121171A US77426A US7742636A US2121171A US 2121171 A US2121171 A US 2121171A US 77426 A US77426 A US 77426A US 7742636 A US7742636 A US 7742636A US 2121171 A US2121171 A US 2121171A
Authority
US
United States
Prior art keywords
barrel
ring
breech
extension
socket
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 - Lifetime
Application number
US77426A
Inventor
Laloux Rene
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE405433D priority Critical patent/BE405433A/xx
Priority to BE404823D priority patent/BE404823A/xx
Priority to DEF78559D priority patent/DE637298C/en
Priority to DEF78596D priority patent/DE680354C/en
Priority to FR794043D priority patent/FR794043A/en
Priority to CH188062D priority patent/CH188062A/en
Priority to US36740A priority patent/US2136512A/en
Priority claimed from US36740A external-priority patent/US2136512A/en
Priority to GB23506/35A priority patent/GB457354A/en
Priority to GB7970/36A priority patent/GB451489A/en
Priority to GB7972/36A priority patent/GB457368A/en
Priority to BE411473D priority patent/BE411473A/xx
Priority to DEF80174D priority patent/DE678065C/en
Application filed by Individual filed Critical Individual
Priority to US77426A priority patent/US2121171A/en
Priority to FR47658D priority patent/FR47658E/en
Priority to US99649A priority patent/US2115861A/en
Priority to GB24988/36A priority patent/GB464572A/en
Priority to NL79250A priority patent/NL44286C/xx
Publication of US2121171A publication Critical patent/US2121171A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/48—Barrel mounting means, e.g. releasable mountings for replaceable barrels
    • F41A21/481—Barrel mounting means, e.g. releasable mountings for replaceable barrels using partial or interrupted threads, e.g. bayonet-type mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A11/00—Assembly or disassembly features; Modular concepts; Articulated or collapsible guns
    • F41A11/04—Articulated or collapsible guns, i.e. with hinged or telescopic parts for transport or storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A17/00—Safety arrangements, e.g. safeties
    • F41A17/46—Trigger safeties, i.e. means for preventing trigger movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/68—Bolt stops, i.e. means for limiting bolt opening movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A9/00—Feeding or loading of ammunition; Magazines; Guiding means for the extracting of cartridges
    • F41A9/29—Feeding of belted ammunition
    • F41A9/32—Reciprocating-slide-type belt transporters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A9/00—Feeding or loading of ammunition; Magazines; Guiding means for the extracting of cartridges
    • F41A9/29—Feeding of belted ammunition
    • F41A9/32—Reciprocating-slide-type belt transporters
    • F41A9/33—Reciprocating-slide-type belt transporters with cartridge stripping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41C—SMALLARMS, e.g. PISTOLS, RIFLES; ACCESSORIES THEREFOR
    • F41C33/00—Means for wearing or carrying smallarms
    • F41C33/08—Handles for carrying smallarms

Definitions

  • the object of the present invention is to use the grip of the ring with broken threads to transport the barrel, to put it into position on the firearm and to lift it off easily.
  • a ring on which a grip is arranged, is screwed onto an extension of the barrel containing the chamber and carries an external broken thread engaging into a corresponding inside thread of the breach case of the firearm.
  • the external thread on the ring has a pitch slightly greater than that of the thread between the ring and the This fastening means allows a very strong attachment to be obtained even if the barrels are not strictly identical and it consequently permits relatively large constructional tolerances.
  • the ring is provided with a springpressed pawl co-operating with stop notches provided on the breech case.
  • the invention provides on the vertical face of the frame situated in front of the ring an abutment operable on at the end of the opening motion of the ring to push the barrel forward.
  • the frame and the barrel are provided with sliding plane faces serving for facilitating the introduction of the barrel; this frame is also provided with a fork which 5 surrounds the barrel towards the forward part of the gas cylinder, said fork being provided with two fiat sides which cooperate with two lateral fiat sides belonging to the barrel.
  • Fig. 1 is an exterior view of a machine gun provided with a barrel fastening means according to the invention.
  • Fig. 2 is an enlarged view of a part of Fig. 1 in partial section.
  • Fig. 3 is an enlarged plan view of a part of Fig. 1.
  • Fig. 4 is a rear view of the barrel.
  • Fig. 5 is a front view of the breech case.
  • the barrel i8 is provided at its rear part with an extension la in which the chamber 53 is provided.
  • This barrel extension [8a is engaged with sliding-friction into the forepart of the breech box 23 and is provided with a screw thread 3i on which is threadedly mounted a ring 35 provided with an external interrupted screw thread 36 comprising two parts which are diametrally opposed.
  • an internal screw thread 31 which corresponds to the thread 36; and besides, apertures 38 diametrally opposed are provided in order to allow the introduction of the screw threaded parts 36 of the ring 35.
  • this external screw thread 3'6 of the ring is slightly greater than that of the inside screw thread 34 and consequently by rotating the ring 35 the bearing face 39 of the barrel is strongly pressed against the corresponding face of the forepart of the breech box.
  • the ring 35 is connected to a handle it! by means of a rod 45 along which slides a spring-pressed pawl 4
  • This handle serves for rotating the ring and for the carriage either of the barrel alone or the automatic rapid fire gun with its barrel.
  • the pawl 41 has an abutment 42 cooperating with ratchet notches or grooves 43 provided in the lateral outside face of the breech box. These grooves avoid the accidental unlocking of the ring whatever the final position of the abutment 42 of the pawl 4
  • a groove 44 is provided upon the forepart of the breech box in such a place that when the abutment 42 is in register with this groove the outside screw thread 36 of the ring is disengaged from the inside screw thread. 3'1 of the breech box, that is to say the barrel is ready for lateral disconnection.
  • a small inclined abutment 46 is provided on the forepart of the breech box and the rod along which slides the pawl 4! presses against this abutment to produce the for- Ward motion of the barrel.
  • a double guide comprising lateral fiat sides 41 on the forepart of the barrel. These flat sides frictionally cooperate with a fork 43 provided near the end of the gas cylinder to ensure a correct positioning of the barrel when setting it in place in the breech.
  • a sliding plane face 49 is provided towards the forepart of the gas cylinder and cooperates with a corresponding plane face of the barrel; besides, towards the rear part of the barrel is provided another plane face 50 which slides on the upper end of the ribs 5
  • a machine gun or similar firearm comprising a barrel provided with an extension at the breech end thereof, a breech casing provided with a socket to receive said extension, said socket having a portion of larger diameter than said barrel extension provided with broken internal screw threads, the external surface of said barrel extension having continuous screw threads formed thereon, a ring threadedly mounted on said barrel extension, said ring having broken threads on the exterior thereof adapted to cooperate with the broken threads in said socket to permit axial insertion of the ring in said socket and to retain the ring therein upon relative rotary movement between the ring and socket, a carrying and actuating handle on said ring, the exterior surface of said breech casing having a series of notches formed thereon, and a pawl mounted. on said handle and adapted to engage one of said notches on the exterior of the breech casing to secure the ring in adjusted rotary positions.
  • a machine gun or similar firearm comprising a barrel provided with an extension at the breech end thereof, a breech casing provided with a socket to receive said extension, said socket having a portion of larger diameter than said barrel extension provided with broken internal screw threads, the external surface of said barrel extension having continuous screw threads formed thereon, a ring threadedly mounted on said barrel extension, said ring having broken threads on theexterior thereof adapted to cooperate with the broken threads in said socket to permit axial insertion of the ring in said socket and to retain the ring therein upon relative rotary movement between the ring and socket, the broken threads of the ring and socket being of a pitch greater than that of the continuous thread of the barrel extension and ring, a carrying and actuating handle on said ring, the exterior surface of said breech casing having a series of notches formed thereon, and a pawl mounted on said handle and adapted to engage one of said notches on the exterior of the breech casing to secure the ring in adjusted rotary positions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Toys (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Earth Drilling (AREA)

Description

June 21, 1938. Q R LALQUX 2,121,171
BARREL FASTENING MEANS Original Filed Aug. 17, 1935 2 Sheets-Sheet l M Op 48 \NVENTOR REN LALOUX ATTORNEY June 21,' 1938; R. LALOUX 2,121,171
BARREL FASTENING MEANS Original Filed Aug. 1'7, 1955 2 Sheets-Sheet 2 I WNVENTOR RENE LALOUX ATTORN 35 extension of the barrel.
Patented June 21, 1938 BARREL FASTENING NEEAN S Rene Laloux, Brussels, Belgium Original application August 17, 1935, Serial No. 36,740. Divided and this application May 1, 1936, Serial No. 77,426. In Belgium August 2 Claims.
' grip for connecting the barrel to the frame of the firearm: in this system the ring with broken threads is mounted on the frame of the firearm and receives the threaded end of the barrel in order to connect it rigidly with the frame of the firearm.
The object of the present invention is to use the grip of the ring with broken threads to transport the barrel, to put it into position on the firearm and to lift it off easily.
The idea of providing a grip serving at the same time for transporting the barrel and for fastening it on the firearm is not new but it is new to arrange the ring with broken threads in such a way that the grip arranged on this ring serves at the same time for the transport and putting into position of the barrel. For
this purpose a ring, on which a grip is arranged, is screwed onto an extension of the barrel containing the chamber and carries an external broken thread engaging into a corresponding inside thread of the breach case of the firearm.
According to the invention the external thread on the ring has a pitch slightly greater than that of the thread between the ring and the This fastening means allows a very strong attachment to be obtained even if the barrels are not strictly identical and it consequently permits relatively large constructional tolerances.
In order to prevent accidental slackening of the barrel, the ring is provided with a springpressed pawl co-operating with stop notches provided on the breech case.
In order to facilitate the removal of the gas piston when dismounting the barrel, the invention provides on the vertical face of the frame situated in front of the ring an abutment operable on at the end of the opening motion of the ring to push the barrel forward.
In order to obtain a good guiding of the barrels when remounting, the frame and the barrel are provided with sliding plane faces serving for facilitating the introduction of the barrel; this frame is also provided with a fork which 5 surrounds the barrel towards the forward part of the gas cylinder, said fork being provided with two fiat sides which cooperate with two lateral fiat sides belonging to the barrel.
The annexed drawings show by way of example and in a non limiting manner an embodiment of the invention.
Fig. 1 is an exterior view of a machine gun provided with a barrel fastening means according to the invention.
Fig. 2 is an enlarged view of a part of Fig. 1 in partial section.
Fig. 3 is an enlarged plan view of a part of Fig. 1.
Fig. 4 is a rear view of the barrel.
Fig. 5 is a front view of the breech case.
The barrel i8 is provided at its rear part with an extension la in which the chamber 53 is provided. This barrel extension [8a is engaged with sliding-friction into the forepart of the breech box 23 and is provided with a screw thread 3i on which is threadedly mounted a ring 35 provided with an external interrupted screw thread 36 comprising two parts which are diametrally opposed.
In the forepart of the breech box is provided an internal screw thread 31 which corresponds to the thread 36; and besides, apertures 38 diametrally opposed are provided in order to allow the introduction of the screw threaded parts 36 of the ring 35.
In order to fix the barrel it is necessary after longitudinal insertion of the screw 36 into the apertures 38, to rotate the ring 35 about a quarter of a turn around its axis in order to engage the screw thread 36 into the screw thread 31 of the breech box.
The pitch of this external screw thread 3'6 of the ring is slightly greater than that of the inside screw thread 34 and consequently by rotating the ring 35 the bearing face 39 of the barrel is strongly pressed against the corresponding face of the forepart of the breech box.
As shown in the drawings, the ring 35 is connected to a handle it! by means of a rod 45 along which slides a spring-pressed pawl 4|. This handle serves for rotating the ring and for the carriage either of the barrel alone or the automatic rapid fire gun with its barrel.
The pawl 41 has an abutment 42 cooperating with ratchet notches or grooves 43 provided in the lateral outside face of the breech box. These grooves avoid the accidental unlocking of the ring whatever the final position of the abutment 42 of the pawl 4| may be.
A groove 44 is provided upon the forepart of the breech box in such a place that when the abutment 42 is in register with this groove the outside screw thread 36 of the ring is disengaged from the inside screw thread. 3'1 of the breech box, that is to say the barrel is ready for lateral disconnection.
In order to remove the gas piston 4 when dismounting the barrel, a small inclined abutment 46 is provided on the forepart of the breech box and the rod along which slides the pawl 4! presses against this abutment to produce the for- Ward motion of the barrel.
For facilitating the introduction of the barrel when remounting the arm a double guide is provided comprising lateral fiat sides 41 on the forepart of the barrel. These flat sides frictionally cooperate with a fork 43 provided near the end of the gas cylinder to ensure a correct positioning of the barrel when setting it in place in the breech.
In order to obtain a correct regulation in height of the barrel, a sliding plane face 49 is provided towards the forepart of the gas cylinder and cooperates with a corresponding plane face of the barrel; besides, towards the rear part of the barrel is provided another plane face 50 which slides on the upper end of the ribs 5| which are provided towards the rear part of the gas cylinder.
The invention is not limited to the embodiment described by way of example, but includes all machine guns or like firearms which enter within the scope of one or the other of the following claims.
What I claim is:
1. A machine gun or similar firearm comprising a barrel provided with an extension at the breech end thereof, a breech casing provided with a socket to receive said extension, said socket having a portion of larger diameter than said barrel extension provided with broken internal screw threads, the external surface of said barrel extension having continuous screw threads formed thereon, a ring threadedly mounted on said barrel extension, said ring having broken threads on the exterior thereof adapted to cooperate with the broken threads in said socket to permit axial insertion of the ring in said socket and to retain the ring therein upon relative rotary movement between the ring and socket, a carrying and actuating handle on said ring, the exterior surface of said breech casing having a series of notches formed thereon, and a pawl mounted. on said handle and adapted to engage one of said notches on the exterior of the breech casing to secure the ring in adjusted rotary positions.
2. A machine gun or similar firearm comprising a barrel provided with an extension at the breech end thereof, a breech casing provided with a socket to receive said extension, said socket having a portion of larger diameter than said barrel extension provided with broken internal screw threads, the external surface of said barrel extension having continuous screw threads formed thereon, a ring threadedly mounted on said barrel extension, said ring having broken threads on theexterior thereof adapted to cooperate with the broken threads in said socket to permit axial insertion of the ring in said socket and to retain the ring therein upon relative rotary movement between the ring and socket, the broken threads of the ring and socket being of a pitch greater than that of the continuous thread of the barrel extension and ring, a carrying and actuating handle on said ring, the exterior surface of said breech casing having a series of notches formed thereon, and a pawl mounted on said handle and adapted to engage one of said notches on the exterior of the breech casing to secure the ring in adjusted rotary positions.
RENE LALOUX.
US77426A 1934-08-21 1936-05-01 Barrel fastening means Expired - Lifetime US2121171A (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
BE405433D BE405433A (en) 1934-08-21
BE404823D BE404823A (en) 1934-08-21 1934-07-21
DEF78559D DE637298C (en) 1934-08-21 1934-12-18 Barrel fastening device for machine guns
DEF78596D DE680354C (en) 1934-08-21 1934-12-25 Machine gun
FR794043D FR794043A (en) 1934-08-21 1935-08-08 Machine gun
CH188062D CH188062A (en) 1934-08-21 1935-08-09 Automatic firearm.
US36740A US2136512A (en) 1934-08-21 1935-08-17 Automatic rapid fire gun
GB7970/36A GB451489A (en) 1934-08-21 1935-08-21 Barrel fastening means for machine guns
GB23506/35A GB457354A (en) 1934-08-21 1935-08-21 Improvements in cartridge feed mechanism for machine guns
GB7972/36A GB457368A (en) 1934-08-21 1935-08-21 Machine gun
BE411473D BE411473A (en) 1934-08-21 1935-09-25
DEF80174D DE678065C (en) 1934-08-21 1935-11-06 Barrel attachment to machine guns
US77426A US2121171A (en) 1934-08-21 1936-05-01 Barrel fastening means
FR47658D FR47658E (en) 1934-08-21 1936-08-26 Machine gun
US99649A US2115861A (en) 1934-08-21 1936-09-05 Machine gun
GB24988/36A GB464572A (en) 1934-08-21 1936-09-14 Barrel fastening means for automatic guns
NL79250A NL44286C (en) 1934-08-21 1936-09-14

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
BE188062X 1934-08-21
BE290934X 1934-09-29
US36740A US2136512A (en) 1934-08-21 1935-08-17 Automatic rapid fire gun
BE2115861X 1935-09-25
US77426A US2121171A (en) 1934-08-21 1936-05-01 Barrel fastening means

Publications (1)

Publication Number Publication Date
US2121171A true US2121171A (en) 1938-06-21

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ID=32046080

Family Applications (2)

Application Number Title Priority Date Filing Date
US77426A Expired - Lifetime US2121171A (en) 1934-08-21 1936-05-01 Barrel fastening means
US99649A Expired - Lifetime US2115861A (en) 1934-08-21 1936-09-05 Machine gun

Family Applications After (1)

Application Number Title Priority Date Filing Date
US99649A Expired - Lifetime US2115861A (en) 1934-08-21 1936-09-05 Machine gun

Country Status (7)

Country Link
US (2) US2121171A (en)
BE (3) BE404823A (en)
CH (1) CH188062A (en)
DE (3) DE637298C (en)
FR (2) FR794043A (en)
GB (4) GB451489A (en)
NL (1) NL44286C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423854A (en) * 1943-12-17 1947-07-15 Clarence E Simpson Head space adjusting and locking means for removable firearm barrels
US20060032103A1 (en) * 2002-07-03 2006-02-16 Ernst Wossner Machine guns having detachable barrels and methods of operating the same

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH229631A (en) * 1941-06-27 1943-11-15 J C Ljungman Ab Self-loading firearm with safety device.
FR2588368B1 (en) * 1985-10-03 1992-08-07 Chatain Jeremie DEVICE FOR TEMPORARILY FIXING THE FRONT PART OF A RIFLE SHAFT, PARTICULARLY, OR OTHER FIREARMS, ON THE CORRESPONDING PART OF THE TUBE
US4920679A (en) * 1988-09-21 1990-05-01 Sarles J Stephen Firearm with detachable barrel
US8794121B2 (en) * 2011-08-23 2014-08-05 General Dynamics—OTS, Inc. Short recoil impulse averaging weapon system
US10145631B2 (en) * 2014-08-11 2018-12-04 Ronnie Barrett Firearm system
RU2619417C1 (en) * 2016-05-04 2017-05-15 Открытое акционерное общество "Завод им. В.А. Дегтярева" Handle for carrying weapons
US9995556B2 (en) * 2016-09-01 2018-06-12 Corby Hall Folding firearm and related methods
US10704860B2 (en) 2016-09-01 2020-07-07 Corby Hall Firearm with laterally folding forearm and barrel, and related methods

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423854A (en) * 1943-12-17 1947-07-15 Clarence E Simpson Head space adjusting and locking means for removable firearm barrels
US20070028500A1 (en) * 2002-03-07 2007-02-08 Woessner Ernst Machine guns having detachable barrels and methods operating the same
US20060032103A1 (en) * 2002-07-03 2006-02-16 Ernst Wossner Machine guns having detachable barrels and methods of operating the same
US7137219B2 (en) * 2002-07-03 2006-11-21 Heckler & Koch, Gmbh Machine guns having detachable barrels and methods of operating the same
US7347023B2 (en) * 2002-07-03 2008-03-25 Heckler & Koch, Gmbh Machine guns having detachable barrels and methods operating the same
US20080134557A1 (en) * 2002-07-03 2008-06-12 Ernst Wossner Machine guns having detachable barrels and methods of operating the same
US7644528B2 (en) * 2002-07-03 2010-01-12 Heckler & Koch, Gmbh Machine guns having detachable barrels and methods of operating the same

Also Published As

Publication number Publication date
GB451489A (en) 1936-08-06
GB457368A (en) 1936-11-26
DE637298C (en) 1936-10-26
US2115861A (en) 1938-05-03
CH188062A (en) 1936-12-15
FR47658E (en) 1937-06-16
BE404823A (en) 1934-09-29
NL44286C (en) 1938-10-15
BE411473A (en) 1935-10-31
GB464572A (en) 1937-04-20
BE405433A (en)
DE680354C (en) 1939-08-26
DE678065C (en) 1939-07-07
FR794043A (en) 1936-02-06
GB457354A (en) 1936-11-26

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