US3624727A - Socket for percussively ignitable multiple-lamp flashbulb units - Google Patents

Socket for percussively ignitable multiple-lamp flashbulb units Download PDF

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Publication number
US3624727A
US3624727A US855467A US3624727DA US3624727A US 3624727 A US3624727 A US 3624727A US 855467 A US855467 A US 855467A US 3624727D A US3624727D A US 3624727DA US 3624727 A US3624727 A US 3624727A
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Prior art keywords
firing
striker
unit
members
received
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Expired - Lifetime
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US855467A
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English (en)
Inventor
William H Horton
Edward L Sturm
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Eastman Kodak Co
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Eastman Kodak Co
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0478—Combinations of photographic apparatus with percussion type flash ignition systems
    • G03B15/0494—Means for mounting percussion type flash apparatus

Definitions

  • the socket member can be rotatively indexed to transport each flashbulb to a predetermined firing position and includes a corresponding plurality of firing members which remain in alignment with the respective percussion elements and which are movable independently to effect displacement of those elements.
  • An ignition member operated by the camera's shutter release mechanism is adapted to move the firing member associated with the flashbulb at the firing position, thereby causing that bulb to fire in predetermined synchronism with the opening of the camera shutter.
  • the present invention relates to cameras adapted to use socalled flashcubes or other multiple-flashbulb units and more particularly to means for supporting and firing multiple-flashbulb units of the percussively ignitable type.
  • flashcubes comprising four fiashbulbs combined in a single-flashbulb unit which is received by a socket member that can be rotated to move each bulb, in turn, into firing position.
  • the bulbs of such fiashcubes have been fired by electrical means, but similar percussively fired flashcubes have recently been developed, as described, for example, in copending US Pat. applications Ser. No. 766,751 entitled PERCUSSION IG- NITABLE FLASH UNIT HAVING CONTACT ACT UATA- BLE PRE-ENERGIZED STRIKERS AND PHOTOGRAPHIC APPARATUS USING SUCH UNITS, filed in the name of J.
  • each flashbulb is adapted to be fired in response to the physical movement of a percussion element associated with that bulb in the flashcube.
  • each flashbulb may be associated with a corresponding precocked striker wire which strikes an impact-sensitive ignition tube of that bulb when the wire is moved out of engagement with a blocking member.
  • the percussion elements preferably are enclosed within the flashcube and are accessible only through relatively small corresponding openings in the base member thereof.
  • the base member opening aligned with the percussion element of the bulb at that position is accessible to a firing member built into the camera; thereby allowing the firing member to effect ignition of that bulb or to operate a signal device to alert the operator to the absence of a usable bulb at the firing position.
  • flashcube sockets and percussive firing devices adapted to function in this manner are disclosed, for example, in the aforementioned applications and in concurrently filed US. Pat. applications Ser. No. 850,701 entitled FLASH FIRING AND SENSING MECHANISM FOR CAMERA OR ATTACHMENT ADAPTED TO USE PER- CUSSIVELY FIRABLE FLASH LAMPS filed in the names of W. H. Horton and C. W. Michatek and US Pat. application Ser. No.
  • the present invention contemplates the provision of a similar camera with a rotatable flashcube socket member including a plurality of movable firing members which remain at all times in alignment with the corresponding openings in the base member of a flashcube carried by the socket member.
  • an igniter member housed within the camera is engageable with the particular firing member associated with that bulb and is adapted to move that firing member in synchronism with the operation of the camera shutter to effect displacement of the corresponding percussion element.
  • that firing member can also be employed before the shutter release mechanism is operated to sense the condition of the operatively positioned flashbulb and to provide a warning signal if that particular bulb has already been fired. Since all of the firing members move with the socket member, the present invention therefore eliminates the need for retracting tho members from the flashcube to allow the latter to be indexed; thus eliminating the mechanism heretofore required to perform that function.
  • FIG. I is a perspective view of a camera of a type adapted to utilize the present invention.
  • FIG. 2 is a perspective view of the base of a percussively ignitable flashcube and of a camera socket member according to the present invention adapted to receive the same;
  • FIG. 3 is a perspective fragmentary view of a percussively ignitable flashcube, partially depicting one of the fiashbulbs therein and showing the percussive ignition means associated with that bulb;
  • FIG. 4 is a somewhat schematic plan view of the drive mechanism of a camera comprising a preferred embodiment of the present invention
  • FIG. 5 is a front elevational view of the mechanism depicted in FIG. 4;
  • FIG. 6 is a perspective illustration of the flashcube socket shown in FIG. 2, depicting the operative elements associated therewith in accordance with the present invention
  • FIG. 7 is a partially fragmented plan view of the structure depicted in FIG. 6;
  • FIG. 8 is an end view of the structure shown in FIGS. 6 and 7, illustrating the means by which a signal is provided in the camera viewfinder to indicate the presence or absence of a usable bulb at the bulb-firing position;
  • FIGS. 9-12 are somewhat schematic front elevational views of the shutter and ignition-actuating means incorporated in the subject camera, illustrating the relative positions of the depicted components during successive stages of operation as the shutter-operating member is actuated and as the film is thereafter wound to prepare the camera for the next exposure.
  • FIG. I designated by numeral 11
  • the camera shown in FIG. I is of generally conventional appearance, comprising a boxlike housing 12, an objective lens assembly 13, a shutter-operating member 14, a handle 15 of a film-winding lever, and a viewfinder 16.
  • a socket member 17 is located within the camera housing and is accessible through a circular opening 18 in the top housing wall I9 to allow a percussively ignitable flashcube 21 to be rotatably supported atop the camera.
  • the percussively ignitable flashcube comprises four fiashbulbs 22,
  • each of the flashbulbs includes a glass envelope 27, which is partially filled with fine zirconium wire or some other combustible material adapted to provide illumination when ignited.
  • the ignition tube 23 of each flashbulb is hollow and relatively thin and contains a percussion-sensitive primer material coated on a central anvil pin within the bore of the tube. As is also shown in FIG.
  • each of the flashbulbs is associated with a corresponding percussion element comprising a resilient striker wire 28, one end of which is supported to the base member and projects upwardly to provide a stop pin 29.
  • the opposite free end of the striker wire is disposed horizontally as shown at 31, and is biased toward the ignition tube of the corresponding flashbulb by the torsional influence of the upwardly extending central loop 32 of the wire.
  • the free end of the striker wire is trapped in a cocked position behind stop pin 29 above the corresponding arcuate slot 33 in the flashcube base member. If the free end of the striker wire is lifted beyond its stop pin, however, it will snap into percussive contact with the ignition tube of the corresponding bulb.
  • the impact of the wire against the ignition tube locally pinches the tube against the anvil pin, causing the primer material to be exploded and thrown upwardly into the glass envelope to effect ignition of the combustible material within the bulb envelope.
  • the flashcube socket member 17 comprised a cylindrical body member 34 to which a cover ring 35 is secured by screws 36.
  • the edge of ring 35 is of somewhat smaller diameter than the body member to provide an annular shoulder 37 received in opening 18 in the top wall of the camera.
  • a similar shoulder 38 at the lower end of the body member is received in the same manner in a corresponding opening in support plate 39. Accordingly, the socket member is supported for rotation about its vertical axis with the top surface of ring 35 substantially flush with the surrounding upper surface of the camera housing.
  • the socket member is provided with a central opening 41 adapted to receive the generally rectangular base post 42 of a percussively ignitable flashcube to rotationally align the flashcube with the socket member.
  • four resilient pawl fingers 43 in the latter engage corresponding openings 44 in the flashcube base post to hold the flashcube in its loaded position.
  • the flashcube can be manually withdrawn from the socket in opposition to the resilient pawl fingers, the latter are of sufficient strength to prevent the flashcube from being dislodged by the upward pressure exerted on the ignition wires to fire the flashbulbs.
  • a sensing pin 45 is received in the tubular central stud 46 of the socket member with'its opposed wings 47 extending outwardly through stud slots 48 into socket opening 41.
  • the sensing pin is urged upwardly by a leaf spring shown at 49 in FIG. 8, whereby the pin assumes a raised position when the socket is empty but is depressed by the base post of a flashcube loaded into the socket member.
  • each firing member 51 is aligned with the corresponding flashcube base slot 33.
  • each firing member includes a central cylindrical flange 52 slidably received in a vertical hole 53 in the socket body member 34; a smaller diameter rod 54 extending below the socket body member through the correspondingly smaller lower end 55 of hole 53; a tongue 56 received in a mating rectangular slot 57 in ring 35; and a radial pin 58 projecting beyond the socket member through a corresponding vertical slot 59 intersecting hole 53.
  • a relatively weak coil spring 61 encircles each tongue and is slightly compressed between the cover ring and the corresponding firing member flange to bias firing member downwardly to the position shown in FIG. 2, in which the upper tip of the tongue is flush with the top surface of the cover ring.
  • the subject camera will be seen to include a filmwinding mechanism comprising a winding lever 62 carried by a rotatably supported vertical shaft 63 and biased in a clockwise direction against a stop pin 64 by a spring 65.
  • the lower end of shaft 63 is connected to the film takeup spool 66 within the camera through a unidirectional clutch depicted at 67, thereby causing film to be wound onto the takeup spool in response to reciprocatory movement of the winding lever.
  • a transmission lever 68 is rotatably supported by vertical stud 69 and is provided with a radial arm 71 which overlaps the adjacent edge of the winding lever in the path of movement of drive lug 72 projecting upwardly therefrom.
  • Slide member 73 is slidably supported by rivets 74 extending though elongate slot 75 and is biased toward the winding lever by a relatively strong spring 76.
  • a vertical car 77 at the end of the slide member adjacent the transmission lever engages the tip of a second arm 78 extending outwardly from the latter, thereby biasing lever 68 in a counterclockwise direction against stop pin 79 as shown in solid lines in FIG. 4.
  • a generally square socket drive member 81 provided with comer cars 82, depends from the socket member as illustrated in FIGS. 4 and 5.
  • a leaf-type positioning spring 83 laterally engages the socket drive member and thereby tends to orient the socket member so that the flashcube therein is parallel to the camera with its forwardly facing flashbulb in firing position.
  • a similar leaf-type drive spring 84 is mounted to the slide member and is also laterally engaged with the socket drive member. Whenever the slide member is in the position shown in solid lines in FIG. 4, shoulder 85 near the free end of spring 84 is positioned beyond the socket drive member; thus relieving the tension of that spring sufficiently to prevent it from interfering with the the flashcube orientation established by positioning spring 83.
  • spring 76 When the winding lever is released and is restored by spring 65 to its initial position, spring 76 likewise returns slide member 73, drive spring 84 and transmission lever 68 to their respective former positions. During this return movement of the drive spring, however, it does not rotate the socket drive member, which is prevented from turning in a counterclockwise direction by positioning spring 83.
  • Drive lever 87 is rotatably supported on stud 69 below transmission lever 68 with its forwardly extending driving arm 88 biased both downwardly and in a counterclockwise direction by a spring 89.
  • the sloped edge 91 of a depending lug 92 on the transmission lever engages the drive lever and rotates the latter in a clockwise direction in opposition to spring 89 as the transmission lever is driven in the same direction by the winding lever.
  • the end of arm 88 connected to spring 89 is held upwardly until it reaches the cocked position shown in broken lines in FIG. 4, whereupon it drops out of engagement with lug 92 and is latched in that position by latch bar 93.
  • the camera is provided with a film-metering mechanism which arrests movement of the winding lever each time a film frame is moved into exposure position.
  • a film-metering mechanism which arrests movement of the winding lever each time a film frame is moved into exposure position.
  • each successive winding operation requires at least one complete movement of the winding lever and not more than a subsequent partial movement of that lever through an angle less than that required to move drive stud 72 into engagement with arm 71 of the transmission lever.
  • each successive film-winding operation will cause the fiashcube to be rotated only once, in the manner just described.
  • a signal lever 94 provided with a translucent signal vane 95, is supported for rocking movement by a pivot stud 96 and is biased downwardly by a weak coil spring 97.
  • An arm 98 extends from the signal lever beneath the socket member and is provided with a cam nose 99, shown in FIG. 8.
  • sensing pin 45 is located in its raised position by leaf spring 49. Consequently, cam disc at the bottom end of the sensing pin is likewise raised to the position shown in broken lines in FIG. 8.- Therefore, disc 101 engages cam nose 99 and holds the signal lever in the position shown in solid lines in FIGS. 6 and 8 to maintain the signal vane above the field of view of the viewfinder comprising lenses 102 and 103.
  • An arcuate sloped cam am 104 is carried by lever 94 laterally adjacent the socket member and is adapted to be engaged by radial pin 58 of the firing member associated with the flashbulb. at the firing position.
  • spring 97 which is strong enough to overcome the downward force of the corresponding firing member ,spring 61 but not strong enough to dislodge a cocked firing wire engaged by the tongue of the firing member. Therefore, if a usable bulb is present at the firing position, the cam arm will assume its intermediate position shown in broken lines in FIG.
  • FIGS. 9-12 The mechanism employed to operate the camera shutter and to fire the forwardly facing flashbulb in synchronism therewith is schematically illustrated in FIGS. 9-12, but it will be understood that analogous previously devised firing and signal mechanisms for use with percussively ignitable flashcubes are likewise compatible with the present invention; e.g., the mechanism disclosed in aforementioned concurrently filed Sturm U.S. Pat. application Ser. No. 850,125.
  • the aforementioned latch bar 93 is pivotally supported by stud I05 and is urged upwardly toward stop pin 106 by a relatively strong spring 107.
  • the latch bar and the shutter-operating member 14 extending therefrom are located as shown in FIG. 9; with the tip of the cocked driving arm 88 trapped by shoulder 108 of the latch bar and resting on horizontal top surface l09 of a stationary guide rail 110.
  • a horizontal drive pin III is supported by vertical segment 112 of that arm.
  • Igniter hammer 113 is carried by the free end of a resilient igniter blade 114, rigidly supported at its opposite end by mounting ear 115.
  • a cam member H6 is carried by the igniter blade and includes a rearwardly facing sloped upper lip 117 and a shorter rearwardly facing lower lip 118. When the camera is in the condition represented in FIG. 9, the lower lip 118 of the cam member is trapped below drive pin lIl, thereby maintaining the igniter blade in its depicted position with igniter hammer 113 located directly below the firing member associated with the forwardly facing fiashbulb.
  • the relatively strong spring 89 urges the tip of driving arm 88 both laterally and also downwardly, thus maintaining that arm temporarily in contact with guide rail 110 in opposition to the weaker upward force exerted on drive pin III by the resiliency of the igniter blade 114.
  • the camera shutter which is of the well-known impact type, comprises a shutter blade 119 pivotally supported by pivot stud 121 and is biased toward pin 122 by a weak spring 123 to maintain the blade normally in alignment with the objective lens aperture shown at 124.
  • a drive lug 125 projects upwardly from the shutter blade beyond the top surface 109 of guide rail 1 10 and is adapted to be struck by the tip of the driving arm, thereby momentarily opening the shutter as explained below.
  • the tip of the driving arm strikes shutter blade drive lug I25 and pivots the shutter blade out of alignment with the objective lens aperture to expose the camera film. Since both the operation of the igniter blade and the firing of the bulb are effected in response to the movement of the driving arm, the bulb therefore flashes in predetermined timed relation to the opening of the shutter.
  • the tip of driving arm 88 abuts against shoulder 126 of guide rail I 10 as shown in FIG. 11, it has passed beyond engagement with the shutter blade, which is then returned to its initial position as soon as spring 123 overcomes the inertia of the blade.
  • the arrival of the driving arm at the end of its movement path is accompanied by the movement of drive pin Ill beyond the cam member carried by the igniter blade, which remains temporarily in its uppermost position.
  • the latch bar Upon the release of the shutter operating member, the latch bar is returned to its raised position shown in FIGS. 9 and 12, thereby lifting the tip of the driving arm above guide rail 110 to reengage that arm with the transmission lever.
  • This upward movement of the tip of the driving am also raises drive pin III to a position in horizontal alignment with the top sloped surface of the cam member.
  • the resulting cocking movement of the driving arm therefore causes drive pin III to cam the igniter blade downwardly while the tip of arm 88 rides along the upper edge surface 127 of the latch bar past drive lug 125 of the shutter blade, as illustrated in FIG. 12.
  • the tip of arm 88 drops past shoulder 108 at the end of latch bar surface 127, thus disengaging the driving arm from the sector lever and restoring the various components to their inoperative positions shown in FIG. 9.
  • a socket member adapted to receive a flash illumination unit including a plurality of percussively ignitable flashbulbs each of which is provided with a corresponding percussion-firing element, said socket member including:
  • orientation means for positioning said illumination unit in predetermined relation to said socket member when said illumination unit is received by said socket member
  • firing means including a plurality of firing members supported by said socket member, said firing members being operatively movable independently of each other into firing cooperation with the corresponding ones of said percussion firing elements of said illumination unit received by said socket member.
  • a camera including:
  • a. shutter means operable to effect exposure of film within said camera
  • a rotatable socket member adapted to receive a percussively ignitable flashcube including a plurality of flashbulbs each of which is provided with a corresponding percussion-firing element
  • socket-indexing means for incrementally rotating said socket member relative to said camera to thereby locate different ones of the flashbulbs of said flashcube received by said socket member at a predetermined firing position
  • firing means including a plurality of firing members carried by said socket member for respective movement into firing cooperation with the corresponding ones of said percussion elements of said flashcube received by said socket member, said igniter member being adapted upon operation thereof to effect such movement only of that one firing member cooperable with the percussion firing element of that flashbulb then located at said firing position to thereby effect ignition of that flashbulb in predetermined synchronism with the operation of said shutter means.
  • indicator means operated by that one firing member in accordance with the position assumed thereby under the influence of said spring means for providing a visible warning signal if the flashbulb located at said firing position has previously been fired.
  • a support member for receiving the flash unit on the camera with each of the respective flash devices at a predetermined position of orientation relative to the socket
  • each of said firing members being movable between a retracted position, wherein said member will be spaced from a respective flash device paired with said member, and an extended position, wherein said member will engage a flash device paired with said member without firing the device, said member being actuatable in the extended position to fire the device, and
  • Photographic apparatus for receiving and firing a multidevice flash unit; each device including a mechanically fireable flashlamp, and a firing element having an energized position from which the element is releasable to fire the flashlamps; the apparatus comprising:
  • a support member for receiving the flash unit on the camera with each of the respective flash devices at a predetermined position relative to the socket
  • each of said firing members having a first extended position for nonreleasably engaging an energized firing element of a respective flash device, and a second extended position for releasing the respective energized firing element and for sensing the absence of an energized firing element;
  • Photographic apparatus as claimed in claim 7, wherein said firing members further have a retracted position, wherein the socket includes means for moving said firing members to their retracted positions when no flash unit is received by said support member, and wherein said last-mentioned means is coupled to said signal device to set said device to its first condition when no flash unit is received by said support member.
  • Photographic apparatus for use with a multilamp flash unit of the type having a plurality of lamps fireable by striking, a striker for each lamp lodged in a preenergized position and dislodgable to fire its lamp and a base having an access opening for each striker through which the striker can be contacted for dislodging, said apparatus comprising:
  • actuating members mounted for rotation with a received multilamp unit, each of said members being aligned with a different one of the access openings of the received unit during such rotation;
  • Photographic apparatus for use with a multilamp flash unit of the type having a plurality of lamps fireable by striking, a striker for each lamp lodged in a preenergized position and dislodgeable to fire its lamp and a base having an access opening for each striker through which the striker can be contacted for dislodging, said apparatus comprising:
  • actuating members mounted for rotation with a received multilamp unit, each of said members being nonreleasably engageable with a difl'erent one of the strikers of the received unit during such rotation;
  • Photographic apparatus for use with a multilamp flash unit of the type having a plurality of lamps fireable by striking. a striker for each lamp lodged in a preenergized position and dislodgeable to fire its lamp and a base having an access opening for each striker through which the striker can be contacted for dislodging, said apparatus comprising:
  • actuating members mounted for rotation with a received multilamp unit, each of said members being movable from a retracted first position through a different one of the access openings of the received unit into nonreleasing engagement with the striker associated with such opening;
  • Photographic apparatus for use with a multilamp flash unit of the type having a plurality of lamps fireable by striking, a striker for each lamp lodged in a preenergized position and dislodgeable to fire its lamp and a base having an access opening for each striker through which the striker can be contacted for dislodging, said apparatus comprising:
  • actuating members mounted for rotation with a received multilamp unit, each of said members having a first position in nonreleasing engagement with one of the strikers of a received unit and a second position to which said member is movable to either release a striker or sense the absence of a striker; means for urging at least one of said members from said first position toward said second position with insufficient force to dislodge a striker but with sufficient force to sense the absence of a striker; and means responsive to the presence of a member in its second position for indicating the absence of the striker to an operator.
  • Photographic apparatus for use with a multilamp flash unit of the type having a plurality of lamps fireable by striking, a striker for each lamp lodged in a preenergized position and dislodgeable to fire its lamp and a base having an access opening for each striker through which the striker can be contacted for dislodging, said apparatus comprising:
  • actuating members mounted for rotation with a received multilamp unit, each of said members having a first position in nonreleasing engagement with one of the strikers of a received unit and a second position to which said member is movable to either release a striker or sense the absence of a striker; means for urging at least one of said members from said first position toward said second position with insufficient force to dislodge a striker but with sufficient force to sense the absence of a striker; a controllable camera component; and means responsive to the presence of a member in its second position for controlling the operation of said component.

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US855467A 1969-09-02 1969-09-02 Socket for percussively ignitable multiple-lamp flashbulb units Expired - Lifetime US3624727A (en)

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US85546769A 1969-09-02 1969-09-02

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US3624727A true US3624727A (en) 1971-11-30

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US (1) US3624727A (de)
JP (1) JPS4930449B1 (de)
BE (1) BE755648A (de)
CA (1) CA924159A (de)
DE (2) DE7032473U (de)
FR (1) FR2060750A5 (de)
GB (1) GB1324706A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706265A (en) * 1970-06-04 1972-12-19 Eastman Kodak Co Photographic apparatus for firing a plurality of flash lamps
US3750548A (en) * 1970-08-31 1973-08-07 Agfa Gevaert Ag Photographic apparatus for use with percussive flash devices
US3810215A (en) * 1973-06-18 1974-05-07 Gte Sylvania Inc Percussive flash extender
US3947222A (en) * 1969-09-25 1976-03-30 Gte Sylvania Incorporated Photographic flashlamp unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US590204A (en) * 1897-09-21 Roll-holding flash-light camera
US2191402A (en) * 1939-08-25 1940-02-20 Saffir Photographic illuminating equipment
US3517182A (en) * 1968-02-07 1970-06-23 Sylvania Electric Prod Photoflash lamp unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US590204A (en) * 1897-09-21 Roll-holding flash-light camera
US2191402A (en) * 1939-08-25 1940-02-20 Saffir Photographic illuminating equipment
US3517182A (en) * 1968-02-07 1970-06-23 Sylvania Electric Prod Photoflash lamp unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947222A (en) * 1969-09-25 1976-03-30 Gte Sylvania Incorporated Photographic flashlamp unit
US3706265A (en) * 1970-06-04 1972-12-19 Eastman Kodak Co Photographic apparatus for firing a plurality of flash lamps
US3750548A (en) * 1970-08-31 1973-08-07 Agfa Gevaert Ag Photographic apparatus for use with percussive flash devices
US3810215A (en) * 1973-06-18 1974-05-07 Gte Sylvania Inc Percussive flash extender

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GB1324706A (en) 1973-07-25
DE2043150A1 (de) 1971-03-25
CA924159A (en) 1973-04-10
BE755648A (fr) 1971-02-15
JPS4930449B1 (de) 1974-08-13
DE2043150B2 (de) 1973-12-13
DE7032473U (de) 1970-11-26
FR2060750A5 (de) 1971-06-18
DE2043150C3 (de) 1974-07-11

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