US3595128A - Bolt assembly - Google Patents

Bolt assembly Download PDF

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Publication number
US3595128A
US3595128A US868380A US3595128DA US3595128A US 3595128 A US3595128 A US 3595128A US 868380 A US868380 A US 868380A US 3595128D A US3595128D A US 3595128DA US 3595128 A US3595128 A US 3595128A
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United States
Prior art keywords
slot
firing pin
longitudinal
main body
aft
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
US868380A
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English (en)
Inventor
John P Hoyt Jr
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.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
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    • 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
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/25—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins
    • F41A19/27—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
    • F41A19/29—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension
    • F41A19/30—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in bolt-action guns
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41F—APPARATUS FOR LAUNCHING PROJECTILES OR MISSILES FROM BARRELS, e.g. CANNONS; LAUNCHERS FOR ROCKETS OR TORPEDOES; HARPOON GUNS
    • F41F1/00—Launching apparatus for projecting projectiles or missiles from barrels, e.g. cannons; Harpoon guns
    • F41F1/08—Multibarrel guns, e.g. twin guns
    • F41F1/10—Revolving-cannon guns, i.e. multibarrel guns with the barrels and their respective breeches mounted on a rotor; Breech mechanisms therefor

Definitions

  • a bolt assembly for a Gatling gun which gun has [52] US. Cl 89/12, a stationary housing with the conventional elliptical cam 42/16 R, 89/27 track; a rotor assembly and a plurality of barrels, adapted to [51] Int. Cl F4ld 7/02 receive a like plurality of said bolt assemblies; includes means [50] Field of Search 89/ 17, 13, for cocking, searing and resetting the firing pin responsive to 27; 42/ l 6, 16.1 the longitudinal disposition of the bolt.
  • This invention relates to an improved self-locking, and resetting bolt assembly, especially adapted for automatic weapons having a plurality of barrels mounted for rotation about a common axis, popularly known as Gatling guns.
  • This invention is an improvement in a type of Gatling gun sometimes called the minigun.
  • the gun conventionally has a stationary housing, and a rotor assembly with a plurality of barrels and a like plurality of bolts, each with its own firing pin and mainspring.
  • the longitudinal movement of the bolt is provided by the conventional housing elliptical cam track.
  • the cocking, searing, and resetting of each firing .pin is controlled by respective cam track in the rotor. Obtaining and maintaining dimensional synchronism among the housing cam track, the bolt and the rotor cam track is a major economic concern.
  • a feature of this invention is the provision of the bolt assembly for a Gatling gun, which gun has a stationary housing with the conventional elliptical cam track; a rotor assembly and a plurality of barrels, adapted to receive a like plurality of barrels, adapted to receive a like plurality of said bolt assemblies, each said bolt assembly including means for cocking, searing and resetting the firing pin responsive to the longitudinal disposition of the bolt.
  • Another feature of this invention is the provision of a bolt assembly which is adapted for use in single barreled guns, said bolt assembly including means for cocking, searing and resetting the firing pin responsive to the longitudinal reciprocation of the bolt.
  • FIG. I is a perspective view of a rotor assembly including bolt assemblies providing a first embodiment of this invention
  • FIG. 2 is an exploded perspective view of a bolt assembly of FIG. 1;
  • FIG. 3 is an exploded perspective view of the bolt assembly of FIG. 1, rotated 180; I
  • FIG. 4 is a side view in cross section of the bolt assembly of FIG. 1;
  • FIGS. 5A and 5B are a bottom and end view in cross section respectively of the bolt assembly in the load disposition
  • FIGS. 6A and 6B are a bottom and end view in cross section respectively of the bolt assembly in the lock disposition
  • FIGS. 7A and 7B are a bottom and end view in cross section respectively of the bolt assembly in the point of firing position;
  • FIGS. 8A and 8B are a bottom and end view in cross section respectively of the bolt assembly in the fired disposition
  • FIGS. 9A and 9B are a bottom and end view in cross section respectively of the bolt assembly in the reset disposition.
  • FIGS. 10A and 10B are a bottom and end view in cross section respectively of the bolt assembly in the extract disposition.
  • the rotor assembly 10 shown in FIG. 1 includes a rotor body 12 having a forward head portion 14 with six ports 16 therein to respectively receive six gun barrels 18 with respective changers 18C.
  • Six longitudinal ribs 20 project radially from the body between the ports and six track elements 22 are respectively bolted to the ribs by studs 24 extending therefrom, and nuts 26.
  • Six bolt assemblies 28 are respectively mounted between immediately adjacent track elements in alignment with respective barrels 18.
  • a rotor forward gear 30 and a rotor forward bearing 32 are fixed on the rotor forward head portion 14.
  • a rotor aft gear 34 and a rotor aft bearing 36 are fixed to the aft end of the rotor body.
  • the rotor assembly is journaled via the forward and aft bearings for rotation in a housing H, briefly indicated by phantom lines, which has an internal, elliptical cam track 38 shown in phantom lines.
  • a guide bar 40 shown in phantom lines, is fixed to the housing and has fingers to direct cartridges 42 from the feeder assembly, not shown, into the extractors of the bolt, and to cam the spent cartridge cases out of the extractors into the ejection chute, not shown.
  • the feeder may be of the type shown in U.S. Pat. No. 3,333,506, issued by R.W. Henshaw et al. on Aug. 1, 1967.
  • Each bolt assembly 28 includes a main body portion 44, a head portion 46, a firing pin 48, and a mainspring 50.
  • a stud 52 extends radially from a a boss on the main body portion and a cam follower roller 54 is captured thereon by a ring 56.
  • a pair of longitudinal side slots 58 are formed cone the main body portion to ride on the rotor track elements 22.
  • a central longitudinal bore 60 is formed in the main body portion, together with a helical cutout 62.
  • An upper triangular shaped cutout 64 and a lower triangular shaped cutout 66 extend through the body portion to the central bore.
  • the head portion 46 includes a pair of longitudinal side slots 68 to ride on the rotor track elements 22.
  • a helical arm 70 extends aft to ride in the helical slot 62.
  • a central longitudinal bore 72 is formed in the head portion, the forward portion having a cone shaped reduction 74 and a smaller diameter aperture 76 into the bolt face 78.
  • Two extractor lugs 80 extend forwardly of the bolt face.
  • the bolt face has a ramp relief surface 82 to guide the extractor plate of the cartridges onto the bolt face when the cartridge is fed to the bolt by the feeder.
  • the bolt also has an alignment slot 84 to engage a rib on the guide bar 40 during feeding, and a relief 86 to clear a feeder sprocket, not shown, and a locking lug 87.
  • the undersurface of the head portion has a L-shaped slot'88, extending to the bore 72, having a longitudinal leg 90 and a transverse leg 92.
  • An access hole 94 extends from the upper surface to the bore 72.
  • the firing pin 38 includes a body portion 95 having a central longitudinal blind bore 96, an aft, longitudinally extending, diametral slot 98, and a forward diametral bore 100.
  • the mainspring 50 is captured in the bore 96 by a crosspin 102 which has a flat 104 cut thereto. The aft end of the mainspring is seated in the flat and prevents loss of the crosspin.
  • a headed crosspin 106 is disposed through and past the access hole 94 into the bore and extends into the L-shaped slot 88.
  • a cone shaped penetrator 108 extends forwardly from the body potion 95 and has a cylindrical tip 110.
  • the firing pin 48 is disposed in the bores 72 and 60 with the crosspin 106 retaining the head portion on the firing pin, and the crosspin 102 retaining the body portion on the firing pin.
  • the rotor body 12 also includes a first set of six T-shaped projections 11, a second set of six T-shaped projections 114, and a set of six annular locking recesses 116, all respectively aligned with, or intermediate with, the barrel bores 16.
  • the edges of the T-shaped projections are aligned with the track elements 22 to provide continuing guide surfaces for the bolts as they advance from the track elements towards the barrels.
  • each bolt assembly is controlled by the elliptical cam track 33 in the housing into which is disposed the cam follower roller 54 of each bolt assembly.
  • a cycle of operation may be considered to start with the load function, which is shown in FIG. 5A.
  • the bolt assembly is in its maximum aft disposition and is adjacent the feeder guide bar.
  • a cartridge is handed off by the feeder sprockets, guided by the guide bar, onto the bolt face 82, where it is held by the extractor lugs 80.
  • the body portion and the head portion are at their maximum mutual separation, with their side slots riding on the track elements 22.
  • the distal end of the crosspin 106 is in the distal end of the transverse leg 92 of the L-slot 88.
  • the distal ends of the crosspin 102 are in the forwardmost apexes of the triangular cutouts 64 and 66.
  • the bolt assembly As the bolt assembly is moved forward it carries the cartridge with it until the cartridge is fully seated in the respective chamber 18C of the respective barrel 18, and the forward edges of the extractor lugs 80 abut the rear face of the barrel. Further forward movement of the bolt head portion is now precluded.
  • the cam follower continues to traverse the bolt body portion forward, so that it rides forward on the now stationary firing pin, and the helical slot 62 cams the helical arm around the firing pin, and with it the head portion which rotates within the annular locking recess 166 so that the bolt locking lug 87 is below and forward of the projection 114, locking the bolt, as shown in FIG. 6A.
  • the crosspin 102 rides along the longitudinal sides of the triangular cutouts 64 and 66, until it reaches the transverse sides of the cutouts and thereafter the mainspring is progressively compressed as the crosspin 102 is carried forward in the firing pin slot 98.
  • the cam follower After firing, the cam follower begins to move aft, carrying the body portion aft, away from the locked head portion, so that the helical cam slot 62 cams the helical cam follower arm 70 and the integral therewith head portion into unlocking rotation.
  • the stationary crosspin 102 abuts the ramp surfaces on the triangular cutouts 64 and 66 and is carnmed aft long the ramp surfaces by the aft-moving bolt body to slightly rotate and positively retract the firingpin and its penetrator without stress on the helical slot and arm.
  • Continued aft movement of the bolt body brings the bolt assembly to the reset position shown in FIG. 9A.
  • a gun bolt assembly comprising:
  • said main body subassembly including:
  • a main body having forward and aft ends
  • said head subassembly including:
  • a head body having forward and aft ends
  • said firing pin subassembly including:
  • a firing pin having a forward penetrator end disposed in said head body longitudinal bore and an aft end disposed in said main body longitudinal bore
  • a gun blot assembly comprising: a main body subassembly; a head subassembly; and a firing pin subassembly; said main body subassembly including:
  • a main body having forward and aft ends, means for providing longitudinal reciprocation to said body, a longitudinal bore in said body opening through said forward end, a helical cam slot, and a triangular, diametral, slot having a longitudinal surface,
  • said head subassembly including:
  • a head body having a forward bolt face and extractor lugs
  • said firing pin subassembly including:
  • a firing pin having a forward penetrator end disposed in said head body longitudinal bore and an aft end disposed in said main body longitudinal bore
  • a gun bolt assembly according to claim 2 wherein:
  • said main body and said head body are at a maximum mutual longitudinal separation and are journaled on said firing pin, with said aft crosspin disposed against the longitudinal forward apex of the triangular slot and the forward crosspin disposed in the distal end of said transverse leg of said L-shaped slot, and said mainspring is relatively uncompressed;
  • said main body and said head body are at a relatively closer mutual longitudinal separation with said head body rotated about said firing pin, with said aft crosspin disposed against the longitudinal aft apex of said triangular slot and said forward crosspin disposed in said transverse leg of said L-shaped slot closely adjacent to said longitudinal leg, and said mainspring is compressed;
  • said main body and said head body are at a minimum mutual longitudinal separation with said head body further rotated about said firing pin, with said aft crosspin disposed against said longitudinal aft apex of said triangular slot and said forward crosspin disposed in said longitudinal leg of said L-shaped slot, with said penetrator of said firing pin extending forward of said head body face.
  • said aft crosspin is cammed relatively aft along said ramp surface of said triangular slot to positively withdraw said penetrator aft into said head body
  • said aft crosspin is cammed relatively forward along said ramp surface of said triangular slot to swing said forward crosspin into said distal end of said transverse leg of said L-shaped slot.
  • a multibarreled gun comprising:
  • a housing having a interior elliptical cam groove
  • a rotor body having a plurality of barrel receiving ports in an annular row, and a like plurality of bolt receiving guideways respectively aligned with said ports, including an annular locking recess adjacent said port, and
  • each bolt assembly comprising:
  • a main body having forward and aft ends
  • cam follower means disposed in said housing cam groove for providing longitudinal reciprocation to said body
  • said head subassembly including:
  • a head body having forward and aft ends
  • said firing pin subassembly including:
  • a firing pin having a forward penetrator end disposed in said head body longitudinal bore and an aft end disposed in said main body longitudinal bore
  • a gun bolt assembly comprising:
  • said main body subassembly including:
  • a main body having forward and aft ends
  • said head subassembly including:
  • a head body having forward and aft ends
  • said firing pin subassembly including:
  • a firing pin having a forward penetrator end disposed in said head body longitudinal bore and an aft end disposed in said main body longitudinal bore
  • firing pin resetting means including said first crosspin for converting relative rotational movement of said main body to said firing pin into relative longitudinal movement aft of said firing pin to said main body.
  • said main body diametral aperture is a triangular slot having a longitudinal surface, a transverse surface, and a ramp surface
  • said firing pin resetting means includes said ramp surface.
  • a multibarreled gun comprising:
  • a housing having an interior elliptical cam groove
  • each bolt assembly comprising:
  • main body subassembly including:
  • said head subassembly including:
  • a head body having forward and aft ends, a longitudinal bore through said head body, a helical cam follower arm mating with said helical cam slot, an L-shaped, diametral, slot having a longitudinal leg and a transverse leg, and a transversely extending locking lug adapted, upon rotation of said head body, to enter said guideway locking recess;
  • said firing pin subassembly including:
  • a firing pin having forward penetrator end disposed in said head body longitudinal bore and an aft end disposed in said main body longitudinal bore
  • firing pin resetting means including said first crosspin for converting relative rotational movement of said main body to said firing pin into relative longitudinal movement aft of said firing pin to said main body.
  • a gun according to claim 8 wherein:
  • said main body diametral aperture is a triangular slot having a longitudinal surface, a transverse surface, and a ramp surface
  • said firing pin resetting means includes said ramp surface.
US868380A 1969-10-22 1969-10-22 Bolt assembly Expired - Lifetime US3595128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86838069A 1969-10-22 1969-10-22

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US3595128A true US3595128A (en) 1971-07-27

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US868380A Expired - Lifetime US3595128A (en) 1969-10-22 1969-10-22 Bolt assembly

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US (1) US3595128A (de)
JP (1) JPS4943436B1 (de)
DE (1) DE2051411C3 (de)
FR (1) FR2066329A5 (de)
GB (1) GB1322527A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316403A (en) * 1980-02-04 1982-02-23 General Electric Company Gun bolt for a high rate of fire revolving battery gun
DE2527666C1 (de) * 1975-06-21 1985-10-31 Diehl GmbH & Co, 8500 Nürnberg Verschluss fuer ein Patronenlager einer Rohrwaffe
US5537769A (en) * 1995-01-10 1996-07-23 Hargraves; John T. Lightweight striker
US6742434B1 (en) * 2003-03-13 2004-06-01 Michael J. Dillon Machine gun
US20060207418A1 (en) * 2005-03-18 2006-09-21 Burke Jimmy W Jr Hand held multibarrel automatic weapon
US20100071243A1 (en) * 2008-09-23 2010-03-25 Browning Firearm having an improved firing pin locking mechanism
US20110083654A1 (en) * 2009-07-02 2011-04-14 Richard David Galinson Paintball loader and paintball Galting gun
US8356543B2 (en) 2009-10-02 2013-01-22 Defense Deisigns, LLC Firearm firing mechanism
US20130219764A1 (en) * 2012-02-28 2013-08-29 Dikar S. Coop. Ltda Bolt assembly for a firearm
US9587895B1 (en) * 2016-01-19 2017-03-07 Brian F. Abbott Rotatable firearm bolt
US20190137204A1 (en) * 2017-11-09 2019-05-09 Brian F. Abbott Ammunition Delinker for a Firearm
WO2019210084A1 (en) * 2018-04-25 2019-10-31 Sig Sauer, Inc. Recoil assembly for a machine gun
US10746493B1 (en) 2019-08-19 2020-08-18 Sig Sauer, Inc. Recoil assembly for a machine gun
US10816294B2 (en) * 2019-02-19 2020-10-27 DeWalch FM, LLC Firearm safing assemblies and firearms including the same
US10823518B1 (en) * 2020-01-13 2020-11-03 Tippmann Industrial Products, Inc. Gatling gun with magazine feed mechanism
US11143488B2 (en) 2019-02-19 2021-10-12 DeWalch FM, LLC Rotatable firearm bolt assembly and firearms including the same
USD952786S1 (en) * 2021-07-09 2022-05-24 TMP Weapons, LLC Firearm rotor
US11680760B2 (en) 2021-04-22 2023-06-20 Scott W. Taunton Rotating gun bolt assembly

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329907A (en) * 1980-02-04 1982-05-18 General Electric Company Gun bolt for high rate of fire revolving battery guns
DE3202462C2 (de) * 1982-01-27 1983-12-08 Mauser-Werke Oberndorf Gmbh, 7238 Oberndorf Mechanische Zündeinrichtung für Feuerwaffen
JPS58158663U (ja) * 1982-04-17 1983-10-22 セイレイ工業株式会社 マルチ作業機のフイルムロ−ル予備装着装置
FR2659135B1 (fr) * 1990-03-05 1992-04-30 Chombart Robert Perfectionnements aux dispositifs de percussion sur les armes portatives a verrou, du type des carabines.
FR2930024B1 (fr) * 2008-04-10 2010-04-30 Anthony Cekic Dispositif de percussion automatique pour arme a feu
DE102020004940B4 (de) 2020-08-13 2023-11-30 Carl Walther Gmbh Verschlussvorrichtung für eine Handfeuerwaffe, Handfeuerwaffe mit einer Verschlussvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US125563A (en) * 1872-04-09 Improvement in revolving-battery gums
US502185A (en) * 1893-07-25 Machine-gun
US2849921A (en) * 1954-04-02 1958-09-02 Company The Schenectady Trust Gatling gun
US3380343A (en) * 1966-12-21 1968-04-30 Gen Electric Firing mechanism for high rate of fire multi-barrel automatic weapon

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US125563A (en) * 1872-04-09 Improvement in revolving-battery gums
US502185A (en) * 1893-07-25 Machine-gun
US2849921A (en) * 1954-04-02 1958-09-02 Company The Schenectady Trust Gatling gun
US3380343A (en) * 1966-12-21 1968-04-30 Gen Electric Firing mechanism for high rate of fire multi-barrel automatic weapon

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2527666C1 (de) * 1975-06-21 1985-10-31 Diehl GmbH & Co, 8500 Nürnberg Verschluss fuer ein Patronenlager einer Rohrwaffe
US4316403A (en) * 1980-02-04 1982-02-23 General Electric Company Gun bolt for a high rate of fire revolving battery gun
US5537769A (en) * 1995-01-10 1996-07-23 Hargraves; John T. Lightweight striker
US6742434B1 (en) * 2003-03-13 2004-06-01 Michael J. Dillon Machine gun
US20060207418A1 (en) * 2005-03-18 2006-09-21 Burke Jimmy W Jr Hand held multibarrel automatic weapon
US20100071243A1 (en) * 2008-09-23 2010-03-25 Browning Firearm having an improved firing pin locking mechanism
US8079168B2 (en) * 2008-09-23 2011-12-20 Browning Firearm having an improved firing pin locking mechanism
US20110083654A1 (en) * 2009-07-02 2011-04-14 Richard David Galinson Paintball loader and paintball Galting gun
US8136515B2 (en) * 2009-07-02 2012-03-20 Richard Galinson Paintball loader and paintball gatling gun
US8356543B2 (en) 2009-10-02 2013-01-22 Defense Deisigns, LLC Firearm firing mechanism
US20130219764A1 (en) * 2012-02-28 2013-08-29 Dikar S. Coop. Ltda Bolt assembly for a firearm
US8844182B2 (en) * 2012-02-28 2014-09-30 Blackpowder Products, Inc. Bolt assembly for a firearm
US9587895B1 (en) * 2016-01-19 2017-03-07 Brian F. Abbott Rotatable firearm bolt
WO2018164738A1 (en) * 2016-01-19 2018-09-13 Brian Abbott Rotatable firearm bolt
US20190137204A1 (en) * 2017-11-09 2019-05-09 Brian F. Abbott Ammunition Delinker for a Firearm
WO2019094783A1 (en) * 2017-11-09 2019-05-16 Abbott Brian F Ammunition delinker for a firearm
US11231248B2 (en) 2018-04-25 2022-01-25 Sig Sauer, Inc. Recoil assembly for a machine gun
WO2019210084A1 (en) * 2018-04-25 2019-10-31 Sig Sauer, Inc. Recoil assembly for a machine gun
US11629927B2 (en) 2018-04-25 2023-04-18 Sig Sauer, Inc. Recoil assembly for a machine gun
US20220049927A1 (en) * 2019-02-19 2022-02-17 DeWalch FM, LLC Rotatable firearm bolt assembly and firearms including the same
US11143488B2 (en) 2019-02-19 2021-10-12 DeWalch FM, LLC Rotatable firearm bolt assembly and firearms including the same
US10816294B2 (en) * 2019-02-19 2020-10-27 DeWalch FM, LLC Firearm safing assemblies and firearms including the same
US11719508B2 (en) * 2019-02-19 2023-08-08 Dewalch Fm Llc Rotatable firearm bolt assembly and firearms including the same
US10746493B1 (en) 2019-08-19 2020-08-18 Sig Sauer, Inc. Recoil assembly for a machine gun
US10823518B1 (en) * 2020-01-13 2020-11-03 Tippmann Industrial Products, Inc. Gatling gun with magazine feed mechanism
US11680760B2 (en) 2021-04-22 2023-06-20 Scott W. Taunton Rotating gun bolt assembly
USD952786S1 (en) * 2021-07-09 2022-05-24 TMP Weapons, LLC Firearm rotor

Also Published As

Publication number Publication date
JPS4943436B1 (de) 1974-11-21
GB1322527A (en) 1973-07-04
DE2051411B2 (de) 1979-09-20
DE2051411C3 (de) 1980-06-04
FR2066329A5 (de) 1971-08-06
DE2051411A1 (de) 1971-05-13

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