US3663012A - Document handling device provided with a number of rotatable hollow drums with suction openings - Google Patents

Document handling device provided with a number of rotatable hollow drums with suction openings Download PDF

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Publication number
US3663012A
US3663012A US881798A US3663012DA US3663012A US 3663012 A US3663012 A US 3663012A US 881798 A US881798 A US 881798A US 3663012D A US3663012D A US 3663012DA US 3663012 A US3663012 A US 3663012A
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United States
Prior art keywords
drum
document
openings
vacuum
valve
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Expired - Lifetime
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US881798A
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English (en)
Inventor
Taco H Van Den Honert
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International Business Machines Corp
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International Business Machines Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/001—Circuit elements having no moving parts for punched-card machines ; for typewriters ; for keyboards; for conveying cards or tape; for conveying through tubes ; for computers ; for dc-ac transducers for information processing ; for signal transmission
    • 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
    • G06K13/07—Transporting of cards between stations
    • G06K13/073—Transporting of cards between stations with continuous movement
    • 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
    • G06K13/107—Feeding or discharging cards from magazine to conveying arrangement using pneumatic means

Definitions

  • DOCUMENT HANDLING DEVICE PROVIDED WITH A NUMBER OF ROTATABLE HOLLOW DRUMS WITH SUCTION OPENINGS BACKGROUND OF THE INVENTION In general the invention relates to high speed document handling devices and more specifically to selective transport devices provided with a number of rotatable hollow drums with suction openings in their cylinder walls.
  • Each elementary transport unit comprises a driven rotatable drum, the internal cavity of which is connected to a vacuum pump via a hollow shaft. Suction openings in the cylinder wall communicate with the vacuum, maintained inside the drum. A document presented to the drum is gripped and transported until'it is released.
  • a first method comprised the use of external mechanical or pneumatic means, permitting the document to approach the drum closely, so that it is gripped; other similar means are used in another place to separate the leading edge of the document from the drum, so that the document is peeled off and entirely released.
  • the second method comprised switching the vacuum in the drum.
  • vacuum switching is indeed suitable for reducing the greatest losses, but it has the drawback of operating comparatively slowly, because of the relatively large volume to be evacuated again each time, which also causes unreliable operation and still considerable losses. If it is attempted to improve the pneumatic slowness by decreasing the volume of the vacuum space, this causes the disadvantage that the buffer effect of a locally large volume of vacuum close to the suction openings is lost, with the adverse effect that a perforation or tear in the document will strongly affect the suction force and consequently'render proper operation uncertain. Furthermore, a thick-walled drum enclosing a small vacuum space will have the disadvantage of a much higher mechanical moment of inertia as compared with thin-walled drums.
  • the object of the invention is to remove the above-mentioned difficulties and drawbacks by providing an improved device for the selective transport of documents, with a number of rotating drums provided with suction openings.
  • the object of the invention is to provide a rotating drum with suction openings, combining a low mechanical moment of inertia with low pneumatic losses, while gripping and releasing of documents can be controlled easily, surely and quickly by low power pneumatic signals.
  • a pneumatically actuated diaphragm valve supported by the drum inside the internal vacuum chamber, opposite a suction opening or group of suction openings, and adapted either to close these openings to the vacuum or to place them in free communication therewith
  • pneumatic logical switching means likewise supported by the drum inside the vacuum chamber and connected to the diaphragm valve for selective actuation thereof, in order to render the suction openings operative any time a document is to be gripped, or to close the openings when no document is to be gripped or a document previously gripped is to be released.
  • the diaphragm valve combines very rapid operation with extremely long life, simple and inexpensive construction and low weight, which properties are all favorable for the present application.
  • Pneumatic logical switching means have been known for some years in various embodiments, which likewise combine light weight and simple construction with rapid operation and long life.
  • these switching means preferably comprise a pneumatic power switch, connected, by way of a channel opening into the drum wall, to the surrounding atmosphere, which is the required high pneumatic level, whereas the other sideof the switch is connected, by way of an orifice, to the vacuum in the vacuum chamber, which serves as the required low pneumatic level, the switch selectively connecting the diaphragm valve to either the high or the low level, in response to pneumatic switch control signals.
  • This power switch may advantageously be a fluid amplifier, preferably a bistable jet amplifier with at least one control input, connected to a source of pneumatic control signals.
  • the pneumatic logical switching means are connected to an external, fixed source of pneumatic control signals for document transport by way of at least one signal line, which is insensitive to rotation of the drum.
  • a signal line insensitive to rotation is preferably provided with a pnuematic slip ring, as will be described in further detail hereinafter.
  • a pneumatic signal line is connected to an observation orifice in the cylindrical drum wall, appropriately disposed, so that signals are generated. by the presence or absence of a gripped document on the drum.
  • suction openings or groups of suction openings in a drum each energized by a separate diaphragm valve with associated separate pneumatic logical switching means, the first group of which is controlled in accordance with the above-mentioned first embodiment for gripping the leading edge of a document, the second group being controlled in accordance with the abovementioned second embodiment, for automatically gripping or releasing the trailing edge of said document.
  • FIG. l is a perspective view, partly cut away and partly sectioned, of a simple preferred embodiment of the invention, comprising two rotating drums.
  • FIGS. 2a and 217 show two different operational states of a first group of suction openings in the drum wall, with an associated first diaphragm valve and first pneumatic logical switching means, as a detail of the device of FIG. 1.
  • FIGS. 3a and 3b show two different operational states of a second group of suction openings in the drum wall, with an associated second diaphragm valve and second pneumatic logical switching means, as another detail of the device of FIG. 1.
  • FIG. 4 shows a section of the hollow drum shaft, detail of the device of FIG. 1, here shown to a larger scale.
  • Drum 12 has a flat bottom integral with the cylindrical wall.
  • the open top can be hermetically sealed by means of a lid, provided with a packing ring (as drawn partially at 13 for drum 1 1).
  • the cylindrical wall is provided with two groups of suction openings 14 and 15.
  • valve housing 16 Inside drum 12, opposite openings 14, is valve housing 16, which has a wedgeshaped recess 17 (FIG. 2a), the wide end of which rests against wall 12, around the group of openings 14, the narrow end converging into throat 18.
  • throat 18 can be closed by means of a diaphragm 19, in which case the suction openings 14 are not energized.
  • diaphragm 19 is retracted from throat 18, as shown in FIG. 2b, recess 17 will communicate, by way of throat 18, disk-shaped cavity 20 and channel 21, with the internal space of drum 12, containing air of subatmospheric pressure, hereinafter to be called vacuum," during operation of the device. How the vacuum inside drum 12 is effected, will be described later.
  • Diaphragm 19 is switched at high speed on account of its very small mass and it has long life.
  • a suitable material is, for example, a polyurethane film of 0.1 to 0.3 mm thick.
  • the diaphragm rests against a perforated supporting disk 24 when it has not been made operative (FIG. 2b). Pressure developed behind disk 24 will make diaphragm 19 operative and lift it (FIG. 2a), to close throat 18, the quickly restored vacuum in disk shaped cavity 20 outside diaphragm 19 aiding in pressing the diaphragm tightly against throat 18.
  • Cavity 25 in valve housing 16 behind disk 24 and diaphragm 19 form part of pneumatic logical control means, generally indicated with 30.
  • these comprise a channel 31, communicating with the outside atmosphere through an orifice 32 in the lid (not shown) of drum 12 (or in the bottom of 12, if so desired).
  • the other end of channel 31 is connected to a cavity 33, serving as a local source of high pneumatic pressure to feed a jet amplifier of known design.
  • the latter furthermore comprises the following channels: a throat 34, two legs 35 and 36 at an acute angle and two control orifices 37 and 38.
  • One leg 35 opens into cavity 25 and is furthermore connected to the internal space of drum 12 via exhaust port 39, the other leg 36 directly opening into this vacuum space.
  • the vacuum inside drum 12 serves as the low feed level for the pneumatic logical control means 30.
  • Channel 31 may be provided with a dust filter.
  • a jet amplifier of symmetrical construction may assume an arbitrary one of two stable operational states, dependent on the most recent control signal received in either of the two control orifices 37 and 38. As can be seen in FIG. 1, the latter areconnected by means of tubes 141, 142, respectively, cou pled, along channels to be described later, to an external fixed source (not shown) of pneumatic control signals.
  • Switching between inoperative and operative states of the suction openings 14 is effected very quickly and at a time that can be detennined accurately, i.e., in a position of drum 12 that can be determined accurately.
  • a rotation rate of, e.g., 2,000 rpm an angle of rotation of 1 corresponds to a time of 0.08 msec.
  • the delay in consequence of the operation of jet amplifier 30 and diaphragm valve 19 together is very small and well reproducible.
  • the presence of a large local buffer space for the vacuum, namely the whole interior of drum 12, guarantees a quick start of the suction, with a likewise reproducible, small delay.
  • the delay of the low-power controlpressure signal between the external signal source and control orifice 37 is constant and can be measured.
  • the local availability of high and low pneumatic feed levels makes it possible to apply local signal processing and signal amplification, which ensures reliable operation.
  • FIGS. 3a and 3b show that the second group of suction openings 15 in drum 12 is controlled by a second diaphragm valve 19, in a manner identical to that described for the openings 14 in FIGS. 2a and 2b.
  • the operative state of suction openings 15 is shown in FIG. 3b.
  • the only difference has relation to the pneumatic logical control means 30 for controlling the pressure in cavity 25 behind diaphragm 19 in FIGS. 3aand 3b.
  • these comprise a channel 41, connecting cavity 25 to an observation opening 42 in the cylindrical drum wall 12.
  • a narrow bleeder 43 connects channel 41 to the vacuum space surrounding valve housing 26.
  • Observation opening 42 is located in cylinder wall 12, between the groups of openings 14 and 15, as represented in FIG. 1.
  • diaphragm 19 for also controlling the vacuum applied to openings will move from the relaxed, straight position of FIG. 3b to the bowed position shown in FIG. 3a when the drum interior is initially evacuated. This change will block the application of vacuum to openings 15. Again the precise reasons for this reaction are not fully understood since the affected volumes have not been fully investigated as to comparative pressures. However, the pressure differentials are adequate to produce thediaphragm movement.
  • the bottom of drum 12 is secured, by means of screws 50, to flange 51 ofa hollow shaft 52 and also to flange 53 ofa gear 54, adapted to be driven by a toothed belt, not shown.
  • Hollow shaft 52 is open at the top and communicates with the inside space of drum 12 by way of an opening in the bottom of the drum.
  • the lower end of shaft 52 is solid and comprises two channels, as shown in FIG. 4. At half its height shaft 52 has a number of circular openings.
  • Shaft 52 is rotatably supported in a fixed bushing 55 by means of a needle roller bearing 56 and a ball bearing 57.
  • Bushing 55 will be secured to a supporting frame.
  • the lower end of bushing 55 is closed with a screwed cap 58.
  • the vacuum inside drum 12 is effected by a connection with a vacuum pump, not shown, along the following path: the hollow space inside shaft 52, an annular recess 60 in bushing 55 opposite said circular openings in shaft 52, nipple 61, tube 62, and T-piece 63, branch 64 of which is connected to the pump.
  • This connection is independent of the rotation of shaft 52 on account of the annular recess 60, with which a channel in the rotatable part 52 and a channel in the fixed part 55 communicate.
  • Such a connection will be called a pneumatic slip ring. Leakage is prevented by two O-rings 65 and 66, disposed for sealing purposes in recesses in bushing 55 on either side of pneumatic slip ring 60.
  • Pneumatic control signals from an external control unit are applied along either of two parallel paths: tubes 70 and 71, pneumatic slip rings 72, 73, respectively, connected to tubes 74, 75, respectively, by way of channels in the solid lower part of shaft 52. These tubes run through the cavity in shaft 52; their upper ends are held by a strip 76 and are connected to the tubes 141, 142, respectively, which, as described, are connected to the pneumatic logical control means 30.
  • drums make it easy to arrange several drums in any desired configuration.
  • the dimensions of the drums need not necessarily be equal; their diameters may be in a proportion of 1:2 or another simple proportion. It is only necessary for the peripheral velocities of the drums to be equal and that the suction openings 14 for the leading document edge in one drum will be opposite similar openings in the adjacent drum.
  • pneumatic logical switching means 30 and 30, which are carried along in the drum for operation of the valve diaphragms 19.
  • Signal amplification may be applied for example in several stages. If a monostable signal amplifier is used instead of a bistable one, a single external signal line will be sufficient, but this requires a more intricate switching logic. For example, an external signal, received with no document on the drum, would mean that a document is to be gripped. Observation of the document gripped, by means of an observation opening such as 42, would result in an indefinite extension of the gripping instruction. Another external signal, received with a document on the drum, would mean releasing the document. Such variations will now be evident for an expert in the field of pneumatic switching logic.
  • Apparatus for transporting documents comprising:
  • a rotatably supported drum having at least one first opening and one second opening in the surface thereof communicating with the interior of said drum, said openings being spaced on said surface to be covered by the leading and trailing portions respectively, of a document carried on said drum surface;
  • first and second valve means each actuatable to selectively connect their respective first and second openings with said vacuum to attract a said document to said surface
  • second switching means in said drum including an observation port on said surface for actuating said second valve means in response to the presence of a said document being carried on said surface.
  • observation port is located on said surface between said first and second openings to be covered by a document when carried by said drum.
  • said second switching means includes a duct connected to said observation port and said duct includes a bleeder orifice connected with said drum vacuum, said bleeder orifice being of a size to establish a fluid pressure in said duct less than ambient pressure when said observation port is covered by said document.
  • first valve means is actuatable between a first position to connect its said openings to said vacuum and a second position to connect said openings with fluid at the ambient pressure
  • said first switching means is operable in response to first fluid pressure signals to actuate said first valve means to said first position and to second fluid pressure signals to actuate said valve means to said second position.
  • said first valve means includes a flexible diaphragm and said first switching means includes a fluid pressure amplifier responsive to said fluid pressure signals for actuating said diaphragm.
  • Apparatus as described in claim 5 further including wall means enclosing said first openings, and converging to a valve port facing said flexible diaphragm therefor that is narrower than the portion of drum surface having said openings therein.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Power Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Manipulator (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Facsimile Scanning Arrangements (AREA)
US881798A 1969-02-10 1969-12-03 Document handling device provided with a number of rotatable hollow drums with suction openings Expired - Lifetime US3663012A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL696902032A NL147703B (nl) 1969-02-10 1969-02-10 Behandelinrichting voor documenten, voorzien van een aantal draaibare holle trommels met zuig-openingen.

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US3663012A true US3663012A (en) 1972-05-16

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US881798A Expired - Lifetime US3663012A (en) 1969-02-10 1969-12-03 Document handling device provided with a number of rotatable hollow drums with suction openings

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US (1) US3663012A (fr)
JP (1) JPS499220B1 (fr)
CA (1) CA935835A (fr)
DE (1) DE2005270A1 (fr)
FR (1) FR2033862A5 (fr)
GB (1) GB1287037A (fr)
NL (1) NL147703B (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101018A (en) * 1975-08-22 1978-07-18 Teletype Corporation Paper edge sensor
US4252307A (en) * 1978-06-28 1981-02-24 International Business Machines Corporation Sheet feed and transport
US4369964A (en) * 1979-12-31 1983-01-25 Ricoh Company, Ltd. Sheet feed apparatus for printer or the like
US4459013A (en) * 1977-08-18 1984-07-10 Xerox Corporation Duplex/simplex precollation copying system
US4512651A (en) * 1977-07-05 1985-04-23 Eastman Kodak Company Collating document feeder and reproduction apparatus having copy duplexing capabilities
US5486253A (en) * 1995-05-17 1996-01-23 B&H Manufacturing Company Method of labeling containers
US5538575A (en) * 1994-10-21 1996-07-23 Cms Gilbreth Packaging Systems Labelling machine and method for applying adhesive to labels for attachment to containers and article therefore
US20030051793A1 (en) * 2001-09-14 2003-03-20 Cavalotti Marie-Laure Benedicte Josette Cutting segment for a false drum and method of supporting material overlying a slot
US6676787B2 (en) 2001-09-14 2004-01-13 The Goodyear Tire & Rubber Company False drum with a variable area vacuum-surface
US6722652B2 (en) * 2001-07-23 2004-04-20 Mitsubishi Heavy Industries, Ltd. Sheet-fed press and intermediate cylinder for sheet-fed press
US20050012265A1 (en) * 2003-07-16 2005-01-20 Heidelberger Druckmaschinen Ag Machine for processing sheets
US20070001391A1 (en) * 2005-06-17 2007-01-04 Aron Shmaiser Rotating vacuum fingers for removal of printing media from an impression drum

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5313128U (fr) * 1976-07-16 1978-02-03
CH639623A5 (de) 1979-06-23 1983-11-30 Winkler Duennebier Kg Masch Einrichtung zum transportieren von flaechenhaften teilen, insbesondere papierblaettern, karten, brief- oder versandhuellen.
DE102010050745A1 (de) 2010-11-08 2012-05-10 Li-Tec Battery Gmbh Verfahren zur Ablage von blattförmigen Objekten und Anordnungen zur Durchführung dieses Verfahrens

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227441A (en) * 1962-08-01 1966-01-04 Rca Corp Document handling apparatus
US3318329A (en) * 1964-07-24 1967-05-09 Ibm Fluid-operated logic devices
US3424063A (en) * 1964-11-19 1969-01-28 Ibm Apparatus using diaphragm - type fluidcontrolled logic devices and method of making same
US3432144A (en) * 1967-03-02 1969-03-11 Us Army Prime mover limit control
US3433257A (en) * 1966-02-01 1969-03-18 Ibm Diaphragm type fluid logic latch
US3466029A (en) * 1967-12-26 1969-09-09 Ibm Fluid-controlled document transport drum

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227441A (en) * 1962-08-01 1966-01-04 Rca Corp Document handling apparatus
US3318329A (en) * 1964-07-24 1967-05-09 Ibm Fluid-operated logic devices
US3424063A (en) * 1964-11-19 1969-01-28 Ibm Apparatus using diaphragm - type fluidcontrolled logic devices and method of making same
US3433257A (en) * 1966-02-01 1969-03-18 Ibm Diaphragm type fluid logic latch
US3432144A (en) * 1967-03-02 1969-03-11 Us Army Prime mover limit control
US3466029A (en) * 1967-12-26 1969-09-09 Ibm Fluid-controlled document transport drum

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101018A (en) * 1975-08-22 1978-07-18 Teletype Corporation Paper edge sensor
US4512651A (en) * 1977-07-05 1985-04-23 Eastman Kodak Company Collating document feeder and reproduction apparatus having copy duplexing capabilities
US4459013A (en) * 1977-08-18 1984-07-10 Xerox Corporation Duplex/simplex precollation copying system
US4252307A (en) * 1978-06-28 1981-02-24 International Business Machines Corporation Sheet feed and transport
US4369964A (en) * 1979-12-31 1983-01-25 Ricoh Company, Ltd. Sheet feed apparatus for printer or the like
US5538575A (en) * 1994-10-21 1996-07-23 Cms Gilbreth Packaging Systems Labelling machine and method for applying adhesive to labels for attachment to containers and article therefore
US5964974A (en) * 1994-10-21 1999-10-12 Trine Manufacturing Company, Inc. Method and apparatus for labeling containers with increased vacuum draw on label drum
WO1996036537A1 (fr) * 1995-05-17 1996-11-21 B & H Manufacturing Company Procede d'etiquetage de recipients
AU712021B2 (en) * 1995-05-17 1999-10-28 B & H Manufacturing Company, Inc. Method of labeling containers
CN1071677C (zh) * 1995-05-17 2001-09-26 B及H制造公司 给容器贴标贴的方法
US5486253A (en) * 1995-05-17 1996-01-23 B&H Manufacturing Company Method of labeling containers
US20040163557A1 (en) * 2001-07-23 2004-08-26 Mitsubishi Heavy Industries Ltd Sheet-fed press and intermediate cylinder for sheet-fed press
US6896258B2 (en) 2001-07-23 2005-05-24 Mitsubishi Heavy Industries Ltd. Sheet-fed press and intermediate cylinder for sheet-fed press
US6722652B2 (en) * 2001-07-23 2004-04-20 Mitsubishi Heavy Industries, Ltd. Sheet-fed press and intermediate cylinder for sheet-fed press
US6676787B2 (en) 2001-09-14 2004-01-13 The Goodyear Tire & Rubber Company False drum with a variable area vacuum-surface
US6736932B2 (en) 2001-09-14 2004-05-18 The Goodyear Tire & Rubber Company Cutting segment for a false drum
US20040140043A1 (en) * 2001-09-14 2004-07-22 Cavalotti Marie-Laure Benedicte Josette Cutting segment for a false drum and method of supporting material overlying a slot
US20040089422A1 (en) * 2001-09-14 2004-05-13 Cavalotti Marie-Laure Benedicte Josette Fals drum with a variable area vacuum-surface
US20030051793A1 (en) * 2001-09-14 2003-03-20 Cavalotti Marie-Laure Benedicte Josette Cutting segment for a false drum and method of supporting material overlying a slot
US7008494B2 (en) 2001-09-14 2006-03-07 The Goodyear Tire & Rubber Co. Cutting segment for a false drum and method of supporting material overlying a slot
US7037404B2 (en) 2001-09-14 2006-05-02 The Goodyear Tire & Rubber Company False drum with a variable area vacuum-surface
US20050012265A1 (en) * 2003-07-16 2005-01-20 Heidelberger Druckmaschinen Ag Machine for processing sheets
US8561987B2 (en) * 2003-07-16 2013-10-22 Heidelberger Druckmaschinen Ag Machine for processing sheets
US20070001391A1 (en) * 2005-06-17 2007-01-04 Aron Shmaiser Rotating vacuum fingers for removal of printing media from an impression drum
US8302955B2 (en) * 2005-06-17 2012-11-06 Hewlett-Packard Development Company, L.P. Rotating vacuum fingers for removal of printing media from an impression drum

Also Published As

Publication number Publication date
DE2005270A1 (de) 1970-08-20
CA935835A (en) 1973-10-23
GB1287037A (en) 1972-08-31
NL6902032A (fr) 1970-08-12
JPS499220B1 (fr) 1974-03-02
NL147703B (nl) 1975-11-17
FR2033862A5 (fr) 1970-12-04

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