US2877017A - Card feeding means - Google Patents

Card feeding means Download PDF

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Publication number
US2877017A
US2877017A US431316A US43131654A US2877017A US 2877017 A US2877017 A US 2877017A US 431316 A US431316 A US 431316A US 43131654 A US43131654 A US 43131654A US 2877017 A US2877017 A US 2877017A
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US
United States
Prior art keywords
card
feed
cards
picker
rocker arm
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
US431316A
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English (en)
Inventor
George A Luning
Lawrence A Wilson
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 NL197373D priority Critical patent/NL197373A/xx
Priority to BE538304D priority patent/BE538304A/xx
Priority to NL113399D priority patent/NL113399C/xx
Priority to US431316A priority patent/US2877017A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to ES0221296A priority patent/ES221296A1/es
Priority to GB11992/55A priority patent/GB770244A/en
Priority to FR1141399D priority patent/FR1141399A/fr
Priority to DEI10205A priority patent/DE1060169B/de
Priority to CH338039D priority patent/CH338039A/fr
Application granted granted Critical
Publication of US2877017A publication Critical patent/US2877017A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K13/00—Conveying record carriers from one station to another, e.g. from stack to punching mechanism
    • G06K13/02—Conveying record carriers from one station to another, e.g. from stack to punching mechanism the record carrier having longitudinal dimension comparable with transverse dimension, e.g. punched card
    • G06K13/08—Feeding or discharging cards
    • G06K13/10—Feeding or discharging cards from magazine to conveying arrangement
    • G06K13/103—Feeding or discharging cards from magazine to conveying arrangement using mechanical means

Definitions

  • This invention relates to card processing equipment and more particularly to an improved card feed utilizing an oscillating rocker motion.
  • a card hopper vis provided with improved high speed card pickers which are oscillatable in an arc'about an axis located adjacent a line projected from the rear edge of the stacked cards.
  • the picker knives are disposed adjacent the rear edge of the stacked cards.
  • the knives with the picked card are moved in. an inward, slightly upward and then downward direction toward the forward portion of the hopper to translate the forward portion of the card to the first feed rollers for subsequent delivery to other card handling apparatus.
  • each picker knife Projecting backwardly and downwardly from the trailing edge of each picker knife is a card stack supporting surface, so tapered as to remain within the are described by the top edge of its respective oscillating feed knife.
  • the supporting surface moves beneath the stack to support the same at a substantially uniform distance from the pivot axis. This reduces the tendency for the cards to bounce at high speed operation and minimizes the possibility of a card miss or failure to pick.
  • picker knife wear is reduced.
  • Fig. 2 is an enlarged vertical transverse sectional view of a card hopper showing the improved card picker and drive means therefor.
  • Fig. 3 is a partially exploded perspective View of the hopper and card feed mechainsm with parts broken away to more clearly show the invention.
  • Fig. 4 is an enlarged detailed sectional view of the card feed head as shown in Fig. 2;
  • Figs. 5l0 are a series of diagrammatic views showing a comparison of card bounce between a standard reciprocating type picker and the improved arc type picker.
  • a machine or mechanism 10 in which tabulating cards 11 may be processed in any suitable manner to obtain the desired information.
  • groups of cards are placed in a suitable feed hopper 12 and are fed or passed from the hopper to the machine and are eventually deposited in a suitable stacker pocket or pockets 13.
  • Fig. l is a diagrammatic side elevational view of one form of card processing apparatus to which the improved card feed is applicable.
  • the card hopper 12 includes a forward or front wall 16 spaced from a bottom wall 17 to define a throat passage 18, end walls 19, only one of which is shown, and a rear wall defined by a pair of upwardly extending guide posts 21 secured to a supporting bar 22. With the exception of the bottom Wall 17, these walls cooperate to receive and hold the stack of cards. 11 in position.
  • a throat knife 23 against which the cards above the bottom card are urged to prevent the passage of more than one card at a time through the throat passage 18.
  • a throat roller or supporting means 24 journaled in a suitable structure 25 to support the central forward edge of the cards in spaced relation to the bottom 17.
  • the means for driving the feed rolls and other apparatus includes a drive shaft 31 connected through suitable means to drive motor (not shown).
  • the drive shaft 31 carries a gear 32 meshing with a gear 33 on the lower feed roll shaft 28 and the upper feed roll shaft 29 is rotated through suitable gearing 34 connected to the lower feed roll shaft 28 to provide an upper feed roll peripheral velocity equal to that of the lower roll.
  • the peripheral velocity of the feed rolls are synchronized with the card picker to translate the card for processing at the desired rate.
  • By providing an upper feed roll of smaller diameter both rolls may be disposed closely adjacent the card passage 18. This is more clearly shown in Fig. 2 wherein the lower edge of the front wall 16 of the hopper and the forward portion of the lower wall 17 are slotted to receive the outer peripheral rim portions of the upper and lower rolls, respectively. While the rims of the rolls are disposed in the slots, they do not contact the stacked cards.
  • Each card feed unit includes a picker knife swivel block or head 37 having forward and rear ends and an upwardly tapering top surface 39 terminating in a feed knife edge 41 which extends parallel to the rear edge of the cards and is adapted to engage the bottom card to translate the same forwardly to the first pair of feed rolls.
  • the head 37 is tapped to provide a bore 42 and is mounted to swivel about the axis of an adjustable post or stud member 43 which in turn is rigidly secured to the upper and outer head end 44 of a rocker arm 45.
  • rocker arms have their lower ends 46 securely clamped to a rocker shaft 47 which defines a rocker arm pivot axis and is journaled in a pair of spaced bearings 48, only one of which is shown, carried in the frame structure 15.
  • the pivot axis of the rocker shaft 47 is positioned at a distance below the hopper to provide an are comparable to the maximum card warp allowable and at a point closely adjacent a projected line extending from the rear edge of the cards for reasons to be hereinafter described.
  • cams 49 Secured to the driving shaft 31 to rotate therewith are a pair of cams 49. Each cam engages and operates the free end of a cam follower 51, the followers having their opposite ends secured to the rocker arm shaft 47. Each cam follower 51 rides on its respective cam surface and is closely positioned with respect thereto so that as the drive shaft 31 is rotated, the cams 49 positively drive the rocker shaft 47 to oscillate the rocker arms 45 and the picker heads 37 in an are about the pivot axis during both the forward and return strokes.
  • the cams define the limit of arcuate travel of the picker and their use with the cam followers at high speed reduces clearance and back lash of the elements to a minimum and thus insures accurate timing of the picker knife with respect to the other apparatus. At lower operating speeds the feed stroke need only be cam operated while the return stroke may be accomplished by other means such as a 7 spring or the like.
  • each picker knife Extending from the rear edge of each picker knife and secured to the picker head 37 to form a portion of the rear end thereof is a U-shaped metal member'52 providing a backwardly and downwardly tapering top surface 53 which as adapted to support the card stack during a portion of the forward and reverse strokes of the picker knife edges 41.
  • This support takes place after the bottom card is picked on the forward stroke and just prior to the positioning of the picker knife at the rear edge of the card on the return stroke.
  • the taper of this movable card support 53 is such that its outer peripheral dimensions remain within the are described by the picker knife edges 41. With a construction of this type, a portion of the card support always remains at a sub stantially constant distance from the pivot axis.
  • Openings 54 may be provided in the support 52 to permit access to the picker head supporting bolts 43. It has been found that to accommodate various degrees of card warpage the rear card support surface should preferably be a cord of the described are between the feed knife edge and trailing edge of the support. By supporting the card stack in this manner during portions of the feed stroke, direct wear on the upper surface of thefeed knives is reduced considerably.
  • the rear wall of the hopper comprising the pair of upright card posts 21 have their lower portions recessed at 55 adjacent the picker heads 37 to provide clearance for the supporting plates 52 during the return stroke of the picker knives.
  • supports 52 are of such length as to not entirely leave the recesses 55 at the end of the forward stroke.
  • the slots 35 in the base member are likewise closed at all times by means of the upper head portions 44 of the rocker arms'and the picker knife heads 37.
  • the slots in the base and recesses in the posts are always substantially covered or sealed at all times against the entrance of large objects, This eliminates the danger of injury to the operator should his finger be placed near the slots 35 in the base or recesses 55 during reciprocation of the picker knives when the hopper is empty.
  • each feed knife edge 41 is at the apex of two oppositely tapering surfaces, the rear card support surface 53 tapers backwardly and downwardly with respect to the oscillatable feed head axis while the forward card surface 39 includ ing the top surface of the free end 44 of the rocker arm slopes downwardly and forwardly toward the base 17 of the hopper. Also, that each feed knife edge 41' and its forward support 39 is disposed above the bottom wall 17 of the hopper 11 as are the throat rollers 24.
  • the forward por tion rests on the throat rollers 24 and the rear portion rests on either the forward or rear card support 39 and 53, respectively, of the picker heads and they do not contact the bottom wall 17 of the hopper.
  • the weight of the card stack is carried by the rocker shaft bearings 48 and should the cards be curled ina concave direction, they do not rest on the bottom wall 17 but lie on the forward, upwardly tapering picker support 39 at the proper angle for picking.
  • the picker heads 37 automatically swivel about their respective posts to accommodate for such warp.
  • the operator places a stack of cards 11 in the hopper 12 to rest on the throat roller 24 and picker heads 37, places the standard weight member 56' on the top card and initiates the card processing operation through suitable control means (not shown).
  • the drive shaft 31 is rotated at the desired speed which in turn rotates the feed rollers 26 and 27, respectively, through the gearings 32 and 34, respectively, and oscillates the rocker arms 45 and the picker heads 37 carried thereby in an are through the cam followers 51 in timed relation.
  • the knives At the outermost limit of arcuate travel of the feed knives, the knives In addition, the trailing edge of the reach zero speed and this represents their substantially maximum vertical displacement from the pivot axis as provided by the rocker shaft 47.
  • the card stack is supported on the forward supporting surfaces 39 and as the feed knife edges 41 are moved inwardly by the cam followers 51, they engage the rear edge of the bottom card at a very slight upward angle at relatively low velocity, in the range of 9 inches per second, after which the velocity is uniformly increased at a very rapid rate. It can be seen that as this initial acceleration occurs, the weight of the stack holds the bottom card in position. After this interval the rear edge of the picked card is moved inwardly and downwardly toward thebottom wall 17 without interference therefrom and this action forces the forward end of the card through the throat 18 to engage the first pair of feed rolls 26 and 27, respectively. At the point of engagement with the feed rollers, the card is moving at its maximum velocity which is approximately the same velocity as the feed rollers.
  • the velocity of the card at the point of leaving the picker knife is approximately 67 inches per second.
  • the rotating earns 49 slow down and stop the arc feed knives and start reversal of the stroke.
  • the rearwardly tapering card sup ports 53 are moved in under the rear edge of the next card and they support the stack at a substantially uniform distance from the pivot axis, regardless of the distance of travel of the feed heads 37. In this manner frictional forces normally provided by the weight of the stack after initial acceleration do not interfere with the bottom card movement.
  • the rear card supports 53 Upon the return stroke of the feed knives, the rear card supports 53 continue to hold the stack in this substantially uniform position until the feed knife edges pass beyond the rear edge of the cards. At this point the stack drops by gravity on the forward supporting surface 39, placing the rear edge of the bottom card adjacent the picker knives. The remaining cards are consecutively fed in like manner.
  • Figs. 8 to 10 it can be seen that with the use of an arc type card picker as disclosed and tapering or relieving the rear card support 53 to stay within the are described by the feed knife edge'41, card bounce is reduced to a minimum within wide limits of card curl 'and other conditions.
  • the forward edge of the cards will remain on the throat roller 24 so that the stack may pivot about this point during the card feeding operation. This prevents jamming of .the cards against the throat knife 23.
  • the arc type picker described is capable of speeds over 2,200 cards per minute with straight and curled cards without failure.
  • damage to the rear edge of the cards has been practically eliminated.
  • a card feed for consecutively advancing stacked cards from a hopper comprising a head having a forward and a rear edge and a top surface, a feed knife edge formed on said top surface intermediate said ends, said top surface being relieved from said feed knife edge toward both ends to provide a forward and rear card supporting surface, a rocker arm mounted to pivot on an axis adjacent a line projected from the rear edge of said cards, means for mounting said head on said rocker arm to provide for swivel movement on an axis normal to said feed knife edge, and means for operating said rocker arm to oscillate said feed knife edge in an arc toadvance the cards, said rear supporting surface supporting the unpicked cards at a substantially uniform distance from the rocker arm axis during the forward and reverse stroke of said feed knife edge.
  • a card feed for consecutively advancing aligned stacked cards from a hopper comprising a head member having an upper surface, a feed knife edge formed on said upper surface defining the outermost projection of said head and extending parallel to the rear edge of the cards to engage the same, a rocker arm pivoted to oscillate on an axis adjacent a line projected from the rear edge of the stacked cards, means for securing said head member to the upper end of said rocker arm, said last-named means including a connection to journal said head mem her for swivel.
  • a card feed for consecutively advancing stacked cards from a hopper comprising a head member having a forward and 21 rear end and a top surface, a feed knife edge disposed on the top surface of said head intermediate said: ends, said top surface being tapered downwardly fromsaid feed knife edge toward both ends to provide a forward and a substantially flat rear card supporting surface, a rocker arm mounted to pivot about an axis disposed inwardly from but adjacent a line projected from the mal edge of the stacked cards, means for securing said head member to said rocker arm, said last-named means including a journal connection to provide swivel movement of said feed knife edge about an axis transverse to said rocker arm axis, and means for oscillating said feed knifeedge in an are by said rocker arm to advance the cards, said feed knife edge moving into contact with the rear edge of.
  • said flat rear card supporting surface holding the unpicked cards at a substantially uniform distance from said rocker arm axis after initial acceleration of the forward stroke and during the reverse stroke of said feed knife edge.
  • a card feed for consecutively advancing stacked cards from a hopper comprising a head member having a top surface, a feed knife edge formed on said top surface and defining the outermost projection of said head member, a rocker arm mounted to pivot about an axis adjacent a line projected from the rear edge of the stacked cards, means for securing said head member to the free end of said rocker arm for movement therewith, said lastnamed means including a journal connection to provide for rocking movement of said head member on an axis transverse to said rocker arm axis, means for oscillating said rocker arm in an are about said axis between zero and maximum velocities to move said feed knife edge into contact with the rear edge of the bottom card at a relatively low velocity and at such an angle to maintain the stack against the card during initial acceleration of the same, and a rearwardly directed projection defining a cardsupport secured to said head member in back of said feed knife edge for supporting the cards in said hopper after the initial acceleration of the forward stroke and during the reverse stroke of said feed knife
  • a card feed head including a feed knife edge for engaging the rear edge of the lower card and a rearwardly projecting card support behind said feed knife edge for supporting: the rear portion of the stacked cards, a rocker arm disposed below said hopper pivoted to oscillate about an axis substantially in alignment with a line projected from the rear edge of the stacked cards, means for securing said card feed head to the upper free end of the said rocker arm to position the feed knife edge at the rear edge of the cards when the rocker arm is adjacent its uppermost limit of travel, said last-named means ineluding, a journal connection to provide for rocking movement of said card feed head and card support onan axis transverse to said rocker arm axis,and means for oscillating said card feed head in an are about; the rocker arm.
  • said card support being tapered inwardly with respect to the rocker arm axis and movable with said card feed head below the. stack to support the same at a substantially uniform distance'from the rocker arm axis to minimize bouncingof the stacked cards during. oscillation of said card feedhead;
  • a hopper for receiving stacked cards and having a lower forward throat section through which cards are consecutively translated
  • a 'card feed head including afeed knife edge for engaging the rear edge of the lower card
  • a rocker arm disposed below said hopper pivoted to oscillate about an axis substantially in alignment with a line projectedfrom the rear edge of the stacked cards
  • means for securing said card feed head to the upper free end of the said rocker arm to position the feed knife edge at the rear edge of the cards when the rocker arm is adjacent its uppermost limit of travel said last-named means including a journal connection to provide for swivel movement of said card feed head on an axis transverse to said rocker arm axis,- means for oscillating said card feed.
  • a card feeding unit including a base portion for receiving, stacked cards and having a lower forward throat section through which cards are consecutively translated, means for supporting a portion of the forward edge of the bottom card at the throat section out ofcontact with said. base, a card feed head including a feed knife edge for engaging the rear edge of the lowermost card and a rearwardly projecting portion defining a card support behind said feed.
  • a card feeding unit including a base portion for receiving aligned stacked cards and having a lower forward throat section through which cards are consecutively translated, means for supporting a portion of the forward edges of the .cards at the throat section out of contact with said base, a card feed head including a feed knife edge for engaging the rear edge of the lowermost card and a rearwardly projecting portion defining a card support behind said feed knife edge for supporting the rear portion of the cards out of contact with said base, a rocker arm disposed below said hopper secured to a rocker arm shaft to oscillate about an axis substantially in alignment with a line projected from the rear edge of the cards, bearing means for supporting said rocker arm shaft, means for securing said card feed head to the upper end of said rocker arm, said last-named means including a journal connection to provide for rocking movement of said card feed head on an axis transverse to said rocker arm axis, and means for oscillating said rocker arm and said card feed head in an are
  • a card feeding apparatus the combination of a hopper having front, side and bottom walls and a guide member including a recessed portion defining a rear wall, said bottom wall being slotted adjacent the recessed portion of said guide member, a feed head member including a card feed knife edge thereon disposed in said slotted portion of said bottom wall and having a rearwardly extending section projecting in the recessed portion of said guide member, a rocker arm mounted to pivot about an axis, means for securing said feed head member to said rocker arm, and means for oscillating said rocker arm and said feed head member in an arc, said feed head member and rearwardly projecting extension maintaining the slot in said bottom wall and the recessed portion of said guide member covered at both extremes of movement of said oscillatable rocker arm.
  • a card feeding apparatus the combination of a hopper having front, side and bottom walls and guides defining a rear wall, each of said guides having a lower recessed portion, said bottom Wall being slotted adjacent the recessed portion of each of said guide members, a card feed head including a card feed knife edge thereon disposed in each of said slotted portions and having a rearwardly extending section projecting into the recessed portion of said guide members, rocker arms mounted to pivot about an axis, an upper end portion carried by each of said rocker arms disposed in each of said slots, means for securing one of said card feed heads to the upper end portion of each rocker arm, and means for oscillating said rocker arms and said card feed heads in an arc, said upper end portions, associated card feed heads and rearwardly directed extensions cooperating to maintain the related slots in said bottom wall and the adjacent recessed portion in said guide members closed at both limits of arcuate travel of said rocker arms.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US431316A 1954-05-21 1954-05-21 Card feeding means Expired - Lifetime US2877017A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL197373D NL197373A (fr) 1954-05-21
BE538304D BE538304A (fr) 1954-05-21
NL113399D NL113399C (fr) 1954-05-21
US431316A US2877017A (en) 1954-05-21 1954-05-21 Card feeding means
ES0221296A ES221296A1 (es) 1954-05-21 1955-04-20 Perfeccionamientos en los aparatos alimentadores de tarjetas
GB11992/55A GB770244A (en) 1954-05-21 1955-04-26 Record card feeding means
FR1141399D FR1141399A (fr) 1954-05-21 1955-05-12 Couteau d'entraînement et dispositif de support de cartes perforées
DEI10205A DE1060169B (de) 1954-05-21 1955-05-13 Vorschubeinrichtung zur Entnahme der untersten Karte eines Kartenstapels
CH338039D CH338039A (fr) 1954-05-21 1955-05-20 Dispositif d'alimentation de cartes perforées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US431316A US2877017A (en) 1954-05-21 1954-05-21 Card feeding means

Publications (1)

Publication Number Publication Date
US2877017A true US2877017A (en) 1959-03-10

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ID=23711400

Family Applications (1)

Application Number Title Priority Date Filing Date
US431316A Expired - Lifetime US2877017A (en) 1954-05-21 1954-05-21 Card feeding means

Country Status (8)

Country Link
US (1) US2877017A (fr)
BE (1) BE538304A (fr)
CH (1) CH338039A (fr)
DE (1) DE1060169B (fr)
ES (1) ES221296A1 (fr)
FR (1) FR1141399A (fr)
GB (1) GB770244A (fr)
NL (2) NL113399C (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991075A (en) * 1958-12-30 1961-07-04 Ibm Bed plate for a card feed
US3341193A (en) * 1965-05-07 1967-09-12 Honeywell Inc Document picker
US3583699A (en) * 1968-12-11 1971-06-08 Ibm Card feeding mechanism and feed knife therefor
US3999747A (en) * 1974-07-17 1976-12-28 Mohawk Data Sciences Corporation Record card feeding apparatus
US4364549A (en) * 1980-01-18 1982-12-21 Hauni- Werke Korber & Co. KG Apparatus for feeding cardboard blanks or the like to a magazine
JPS58110655U (ja) * 1982-01-22 1983-07-28 キヤノン株式会社 紙受けトレ−

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144722B (en) * 1983-07-21 1987-07-22 Royston Douglas Molineux Ticket dispensing machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US192519A (en) * 1877-06-26 Improvement in postmarking and canceling machines
GB464213A (en) * 1935-11-06 1937-04-14 Powel & Hill Ltd Improvements in and relating to means for feeding pallets to a machine for making concrete tiles, bricks, blocks or the like
US2677543A (en) * 1950-06-08 1954-05-04 Container Corp Sheet feeding mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1741985A (en) * 1924-11-07 1929-12-31 Tabulating Machine Co Sorting machine
US1707755A (en) * 1924-11-19 1929-04-02 Tabulating Machine Co Record-card-controlled machine for sorting and the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US192519A (en) * 1877-06-26 Improvement in postmarking and canceling machines
GB464213A (en) * 1935-11-06 1937-04-14 Powel & Hill Ltd Improvements in and relating to means for feeding pallets to a machine for making concrete tiles, bricks, blocks or the like
US2677543A (en) * 1950-06-08 1954-05-04 Container Corp Sheet feeding mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991075A (en) * 1958-12-30 1961-07-04 Ibm Bed plate for a card feed
US3341193A (en) * 1965-05-07 1967-09-12 Honeywell Inc Document picker
US3583699A (en) * 1968-12-11 1971-06-08 Ibm Card feeding mechanism and feed knife therefor
US3999747A (en) * 1974-07-17 1976-12-28 Mohawk Data Sciences Corporation Record card feeding apparatus
US4364549A (en) * 1980-01-18 1982-12-21 Hauni- Werke Korber & Co. KG Apparatus for feeding cardboard blanks or the like to a magazine
JPS58110655U (ja) * 1982-01-22 1983-07-28 キヤノン株式会社 紙受けトレ−
JPS6241007Y2 (fr) * 1982-01-22 1987-10-20

Also Published As

Publication number Publication date
BE538304A (fr)
ES221296A1 (es) 1955-12-16
NL113399C (fr)
CH338039A (fr) 1959-04-30
DE1060169B (de) 1959-06-25
GB770244A (en) 1957-03-20
FR1141399A (fr) 1957-09-02
NL197373A (fr)

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