US3840104A - Machine for engraving on curved metallic surfaces - Google Patents

Machine for engraving on curved metallic surfaces Download PDF

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Publication number
US3840104A
US3840104A US00319796A US31979672A US3840104A US 3840104 A US3840104 A US 3840104A US 00319796 A US00319796 A US 00319796A US 31979672 A US31979672 A US 31979672A US 3840104 A US3840104 A US 3840104A
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United States
Prior art keywords
disc
piercers
rotation
machine according
engraved
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Expired - Lifetime
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US00319796A
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English (en)
Inventor
D Groppini
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Dalmine SpA
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Dalmine SpA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • F17C13/003—Means for coding or identifying them and/or their contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/0076—Machines or apparatus for embossing decorations or marks, e.g. embossing coins having a series of embossing tools each of which can be brought into working position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/05—Vessel or content identifications, e.g. labels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2181—Metal working processes, e.g. deep drawing, stamping or cutting

Definitions

  • ABSTRACT Pulfrey Assistant Examiner-Paul .1 Hirsch Attorney, Agent, or Firml(enyon Kenyon Reilly Carr & Chapin 571 ABSTRACT A piercing machine for marking writings, numbersand the like on metallic curved surfaces, such as the ogiveshaped portion of steel cylinders, which allows for the marking by engraving also of symbols varying from one piece to be marked to another, without hand substitution of the piercer elements.
  • the piercers are disposed and held on a disc along a spiral arrangement. This disc may be operated and driven into rotation by two independent mechanisms, one for the engraving of the symbols which are always the same, and the other for the variable symbols.
  • the first mechanism causes and intermittent mono-directional rotation movement, while the second mechanism causes a continuous rotation, in both the senses.
  • the disc bearing the piercers can be brought into rotation alternatively by only one of said two mechanism, but in any case,
  • SHEET MUF MACHINE FOR ENGRAVING ON CURVED METALLIC SURFACES BACKGROUND OF THE INVENTION Several kinds of machines are known, suitable for marking through engraving, by means of piercers, cylinders on the so-called ogive portion, the shape of which is given by the rotation of a profile with a circumferential arc configuration, around the axis of the cylinder.
  • the radius of said arc may be slightly smaller, equal or slightly greater in size than the radius of the cylindric body of the cylinder itself.
  • the piercers which are made out of steel and have at one end a given alphabetical or numerical sign or a design mark, are placed one after the other along the circumference of a disc rotating around its own axis, or are placed side by sideon several rows on a table of an adequate shape, or the one close to the other in various containers.
  • the writings, numbers and /or designs are usually markedalong a circumference of the ogive and for each radius this circumference may have, the prolongation of the axis of the piercer always passes throughthe' axis of the cylinder and through the center of the are which defines the profile of the ogive.
  • the axis of the piercer has to be aligned with the axis of a-hammering device which, acting on the head of the piercer, pushes its opposite end, i.e., that which represents the alpha-numerical sign or the de sign, in order to engrave the metallic surface to be marked.
  • the piercing machine is characterized in that the devicesupporting the piercers comprise a disc on which the piercers are placed in a spiral arrangement this disc supporting the piercers is operated, during its rotation, by two different and independent mechanisms, one for the engraving of fixed symbols, i.e., those which have to be impressed in the same succession of signs for each cylinder of the same lot, and the'other mechanism for the operation of the disc during the engraving of the variable symbols on each cylinder.
  • the first mechanism consists of a ratchet gear which impresses an intermittent mono-directional rotation movement of a constant angular amplitude corresponding to the space between two contiguous piercers.
  • the second mechanism consists of a cylinder-piston system operating a rack which meshes with a pinion gear integral with the shaft of the disc supporting the piercers, which is capable of a continuous rotation, in both directions, by angle values corresponding to the angle existing between contiguous piercers or multiples thereof.
  • Another important advantage of the piercing machine according to the present invention is given by the uniform and simple kind of movementof the disc during the succession of all piercers, i.e., an intermittent rotation at a constant angular value'which is combined with a uniform translation of the axis of the disc in respect of the hammering device, in order to maintain coaxial therewith the engraving piercer, irrespective of its position along'theabove-mentioned spiral.
  • the translation of the disc axis is obtainedby a cam rotating in phase with the same disc bearing the piercers and having a spiral profile, in particular shaped as an Archimedean spiral, the radius of which increases according to a law identical to that of the spiral along which the piercers are arranged.
  • a further advantage of the piercing machine accord: ing to the present invention is given by the fact that it is possible to engrave writings along different, coaxial circumferences of the ogive while the disc bearing the piercers continues its regular and uniform movement.
  • cylinders are usually engraved along two, three, four or five circumference arcs having the centers on the axis of the cylinder itself and angular amplitudes usually in the range between about and For this arrangement of the marking, in order to avoid idle time when running along wide angle shots uselessly-, the,
  • the cylinder to be engraved is supported in any previously known manner and for example, at the nose portion by a sleeve which also gives the drive for the required rotation to mutually space the various types of a writing and on the opposite side of the cylinder, by an appropriate idle funnel or operated by an oloedynamic piston.
  • the operating means for beating the piercers can consist of an electromagnetic hammer, being particularly capable of giving a beating force adequate to each piercer, as that described in the Italian Patent No. 859256 in the name of the same Assignee.
  • FIG. 1 schematically represents the disc bearing the piercers together with the two devices for operating the rotation of the disc
  • FIG. 2 schematically represents the succession according to which the piercers are arranged on the disc
  • FIGS. 3a and 312 respectively represent two views, which are perpendicular each other, of the device for the movement of the axis of the disc bearing the piercers;
  • FIG. 4 represents a schematic view of the overall piercing machine, with particular regard to the support means of the cylinder and to the device for operating the movement of an anvil adapted to contrast the knocking on the piercer.
  • the disc 1 bearing the piercers is shown together with the two devices for giving the rotation drive i.e., the ratchet gear for the monodirectional intermittent rotation and the rack-piston system for the continuous rotation in both directions i.e., clockwise and counterclockwise, as viewed.
  • the dotted line 2 represents the spiral, in particular an Archimedean spiral, along which the holes 3 are provided on the disc, suitably spaced apart, and therein the piercers (not show in FIG. I) are inserted,
  • the mechanism for operating the mono-directional and intermittent rotation movement of the disc I bearing the piercers comprises a piston-cylinder 5 the piston rod 5' of which operates a tooth 4 ofa ratchet gear meshing with the toothed periphery 12 of the disc 1 in order to cause the same disc to rotate by an angle corresponding to the space between two contiguous signs, whenever the cylinder 5 is operated.
  • a pawl 7 On the piston-rod 5, through a bush 6, a pawl 7 is fixed, pivotedly mounted in 8, having the function of locking in a working position the disc I after each thrust imparted by the ratchet gear 4.
  • the pawl 7 when rotating around the pivot 8, disengages from the teeth 12 of the disc 1, while during the idle reversal stroke or the tooth 4, it operates again by locking the disc in the required working position in correspondence of which the portion of the ogive to be engraved, the piercer to be beaten and the hammering device are all positioned on the same axis.
  • a pinion 9 which meshes with a rack 10 driven by a piston rod 11 slidably mounted within a double-acting cylinder 11.
  • this cylinder 11 Upon the disengagement of tooth 4 and pawl 7, this cylinder 11 enables the rotation of the disc 1 in both the directions in order to select thepiercers, relative to the variable symbols, to be positioned in the proper succession under the hammering device.
  • the required rotation in the required direction is given to the disc 1 by the system rack 10 cylinder 11 piston 11' through an oleodynamic control device actuated by a known two-way electrovalve not shown in the drawing.
  • the slide shutter of the electrovalve is electrically controlled in either directions by electric signals preferably transmitted by a usual memory being preset, for example, through a manual keyboard actuated by an operator which reports the variable symbols previously written on each cylinder, such as by chalk.
  • the operation of the piercing machine according to the present invention may be completely automated when said memory, instead of being set by a keyboard manually controlled by the operator, can be directly set in input by a control weightometer positioned before the piercing machine, by which the variables of each cylinder (weight and capacity) are measured and moreover the identification number of the container is allotted.
  • FIG. 2 schematically represents the manner in which the piercers are arranged on the disc 1 according to an example of marking bothfixed and variable symbols.
  • the first piercer of the symbol to be engraved being the disc represented in the starting position.
  • ten piercers are mounted bearing FIGS. 1, 2, 3 8, 9, 0, referred to as b, by which the identification number of the cylinder can be completed, the first figures of which are given by the last four piercers of the group a.
  • the piercers have been represented, through their respective signs, on a spiral which for graphic convenience includes less than one turn. However, it is obvious that, according to the invention, the piercers may be arranged along one or more turns of a spiral.
  • the disc 1 operated by the ratchet gear 4, starts the intermittent rotation in the sense of an arrow F, by constant angles, the amplitude of which corresponds to the pitch or interval between two adjacent piercers.
  • the signs of the group a are engraved with the same sequence order with which the piercers are arranged on the disc.
  • the ratchet gear 4 is disengaged, for example through a device 13 as shown in FIG. 1, and the system piston-rack is operated.
  • the disc will rotate of suitable angle values in order to bring successively under the hammer the piercers of the group b having the required figures to complete the identification number of the cylinder during this engravingstage, for example the 'two figures corresponding to the tens and units represented in heavy types in FIG. 2 of the drawings; of course the'last figure of the identification riumber is variable at each cylinder, the last but one figure is variable every ten cylinders and so on.
  • the rack 10 After having engraved the last variable figure, the rack 10, controlled by the memory, will cause the disc 1 to rotate until it brings under the hammer the first piercer of the second fixed symbol a which in this case bears the letter 0" from the word oxygen. After having engraved this sign, the rotation of the disc by means of the rack is disconnected and the ratchet gear 4 is again automatically actuated, for example through the device 13. The ratchet gear will operate the rotation of the disc step by step until the group of signs a is completed. Then, by changing again the control device of the disc, the series of signs for the second variable symbol b' indicating the capacity and the'weight, will be engraved, for example:
  • the rotation movement of the disc 1 is transmitted to a cam 20 by means of a pair of toothed wheels 21 and 22.
  • the periphery of the'cam 20 is constantly in engagement with a fixed abutment 23 and since the cam 20 is pivotedly mounted on the slide 18, each rotation of said cam causes a traverse of the slide itself and therefore of the disc 1 according to a law which is a function of the profile shape of the cam 20. If the cam 20 has a spiral-shaped profile, the radius of which increases according'to a law identical to that of the spiral along which the piercers 14 are arranged on the disc I, the shifting of the disc 1 bearing the piercers is such that the piercer to be beaten is always coaxial with the hammer 16.
  • a cylinder is represented during the piercing operation being supported by two end bearings 24 and 25, at least one of which is a driving means'and such as to cause the cylinder to rotate intermittently in the sense of the arrow G.
  • An anvil or wedge 26 for taking up the beating force ispushed by a piston 27 along an inclined-plane 28 and is positioned underthe cylinder 15 when this latter'has completed the necessary rotation for enabling the usualspace between two subsequent signs.
  • the wedge 26 is again pushed backwards being moved away from the cylinder thus allowing the subsequent rotation.
  • a machine for engraving of types or marks on curved metallic surfaces comprising a disc
  • a plurality of piercers mounted on said disc in a spiral arrangement, a hammering means for beating on a selected one of said piercers in a fixed position, means for supporting and rotating the metallic surface to be engraved, first means for intermittently rotating said disc in a mono-direction in a step-by-step sequence, each' said step corresponding with an angular space between two adjacent piercer's, second means for rotating said disc in a selected one of a clockwise and counterclockwise direction over an angle corresponding to at least one angular space between two adjacent piercers, said piercers being perpendicular to the plane of said disc, and further comprising displacement means for displacing said disc in said plane.
  • said piercers are associated with fixed symbols for each subsequent metallic surface to be engraved and are arranged on said disc and along said spiral shape accord ing to a subsequence order corresponding exactly to that of the fixed symbol to be engraved.
  • a machine according to claim 1', wherein said device for supporting and rotating the metallic surface to be engraved comprises means for rotating said metallic surface intermittently in one of a clockwise and counterclockwise direction.
  • a machine further comprising an anvil means for taking up the force of said hammering means on the piercer and means for bringing said anvil into contact with said metallic surface in a means itself, and for-disengaging said anvil upon the beating of the hammering means and before the following operation of said supporting and rotating device for causing the subsequent sign to be engraved on the metallic surface.
  • said disc has a toothed periphery and said first means comprises a ratchet gear adapted to engage the toothed periphery of said disc, said ratchet gear being operated by a cylinder-piston system having a-piston rod also adapted to act on a locking pawl by disengaging said pawl from said toothed periphery during the operation of said v.ratchet gear.
  • a machine wherein said disc ismounted on arotatable shaft and said means comfile of said cam has a spiral-shape the radius of which increases according to a law being the same as that of the spiral along which said piercers are arranged on said disc, whereby the displacement of the disc always allows for the complete correspondence and the maxi ality between each of the piercer and the hammering means for beating thereon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US00319796A 1971-12-29 1972-12-29 Machine for engraving on curved metallic surfaces Expired - Lifetime US3840104A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT33054/71A IT944460B (it) 1971-12-29 1971-12-29 Macchina per l incisione di scrit te e simili mediante punzonatura su superfici metalliche curve in particolare su ogive di bombole in acciaio

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US3840104A true US3840104A (en) 1974-10-08

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US00319796A Expired - Lifetime US3840104A (en) 1971-12-29 1972-12-29 Machine for engraving on curved metallic surfaces

Country Status (10)

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US (1) US3840104A (ru)
JP (1) JPS5611600B2 (ru)
AT (1) AT323518B (ru)
DE (1) DE2263701A1 (ru)
FR (1) FR2170628A5 (ru)
HU (1) HU173439B (ru)
IT (1) IT944460B (ru)
PL (1) PL82174B1 (ru)
RO (1) RO62032A (ru)
SU (1) SU634646A3 (ru)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227454A (en) * 1978-08-22 1980-10-14 M. E. Cunningham, Company Hydraulically operated drum series printer
US4314505A (en) * 1978-10-13 1982-02-09 Columbia Marking Tools, Inc. Rotary wheel type marking head
US6095723A (en) * 1999-01-19 2000-08-01 Nemco Medical Engraving tool and method for forming
US20130025344A1 (en) * 2007-07-06 2013-01-31 Mettler-Toledo Ag Check weight, method and system to ensure traceability of same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL101642B1 (pl) * 1975-12-15 1979-01-31 Zaklady Przemyslu Precyzyjnego Apparatus for indentational marking ofmetallic cylindrical wares,particulary steel cylinders for high-pressure gases
FR2762241B1 (fr) * 1997-04-18 1999-07-09 Provencale D Automation Et De Dispositif de marquage de bouteille de gaz de petrole liquefie (gpl)
TW201350355A (zh) * 2012-06-01 2013-12-16 Hou-Fei Hu 一種字模、使用該字模之手工具壓字方法及其製品

Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1145832A (en) * 1911-01-10 1915-07-06 Harry T Ambrose Escapement mechanism for type-writers, &c.
US1625890A (en) * 1924-05-10 1927-04-26 Woodstock Typewriter Co Escapement mechanism for typewriters
US2003211A (en) * 1934-09-05 1935-05-28 Royal Typewriter Co Inc Typewriting machine
US2438271A (en) * 1946-02-06 1948-03-23 Addressograph Multigraph Apparatus for indenting characters in medals and the like
US2579763A (en) * 1948-12-22 1951-12-25 Remington Rand Inc Cushioned escapement support
US2908218A (en) * 1955-07-08 1959-10-13 Naz Prodotti Chimici E Farmace Machine for printing on articles in the shape of developable bodies of revolution
US2920556A (en) * 1956-11-21 1960-01-12 Owens Illinois Glass Co Machine for decorating round surfaces
US3019725A (en) * 1960-03-14 1962-02-06 Plax Corp Supporting containers for printing thereon
US3029920A (en) * 1960-06-27 1962-04-17 Addressograph Multigraph Embossing machine
US3054494A (en) * 1958-09-09 1962-09-18 Dalmine Spa Method and apparatus for marking curved surfaces
US3160092A (en) * 1964-01-20 1964-12-08 Eisen Carl Apparatus for printing on cylindrical containers
US3174426A (en) * 1962-01-09 1965-03-23 Kwikmrk Inc Electromagnetic inertia impact article marking machine
US3249044A (en) * 1965-04-06 1966-05-03 William M Karlyn Automatic stencilling machine with smear preventing means
US3330396A (en) * 1964-12-07 1967-07-11 Richard F James Coin operated embossing machine with ratchet to predetermine maximum number of letters
US3356199A (en) * 1966-02-23 1967-12-05 Friden Inc Printer having type disk rotatable in a plane parallel to the printing line
US3363546A (en) * 1962-10-16 1968-01-16 Owens Illinois Inc Container decorating means with means for holding and indexing work
US3478680A (en) * 1965-07-06 1969-11-18 Owens Illinois Inc Method and apparatus for decorating hollow plastic articles
US3578129A (en) * 1967-08-30 1971-05-11 Mitsubishi Electric Corp Control device for positioning carriages of business machines
US3625330A (en) * 1969-04-21 1971-12-07 Addressograph Multigraph Registration alignment device for embossing machine
US3630334A (en) * 1969-05-09 1971-12-28 Marie Z Connolly Embossing apparatus for curved container surfaces
US3643771A (en) * 1969-07-16 1972-02-22 Kusutugu Takebe Medal stamping machine

Patent Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1145832A (en) * 1911-01-10 1915-07-06 Harry T Ambrose Escapement mechanism for type-writers, &c.
US1625890A (en) * 1924-05-10 1927-04-26 Woodstock Typewriter Co Escapement mechanism for typewriters
US2003211A (en) * 1934-09-05 1935-05-28 Royal Typewriter Co Inc Typewriting machine
US2438271A (en) * 1946-02-06 1948-03-23 Addressograph Multigraph Apparatus for indenting characters in medals and the like
US2579763A (en) * 1948-12-22 1951-12-25 Remington Rand Inc Cushioned escapement support
US2908218A (en) * 1955-07-08 1959-10-13 Naz Prodotti Chimici E Farmace Machine for printing on articles in the shape of developable bodies of revolution
US2920556A (en) * 1956-11-21 1960-01-12 Owens Illinois Glass Co Machine for decorating round surfaces
US3054494A (en) * 1958-09-09 1962-09-18 Dalmine Spa Method and apparatus for marking curved surfaces
US3019725A (en) * 1960-03-14 1962-02-06 Plax Corp Supporting containers for printing thereon
US3029920A (en) * 1960-06-27 1962-04-17 Addressograph Multigraph Embossing machine
US3174426A (en) * 1962-01-09 1965-03-23 Kwikmrk Inc Electromagnetic inertia impact article marking machine
US3363546A (en) * 1962-10-16 1968-01-16 Owens Illinois Inc Container decorating means with means for holding and indexing work
US3160092A (en) * 1964-01-20 1964-12-08 Eisen Carl Apparatus for printing on cylindrical containers
US3330396A (en) * 1964-12-07 1967-07-11 Richard F James Coin operated embossing machine with ratchet to predetermine maximum number of letters
US3249044A (en) * 1965-04-06 1966-05-03 William M Karlyn Automatic stencilling machine with smear preventing means
US3478680A (en) * 1965-07-06 1969-11-18 Owens Illinois Inc Method and apparatus for decorating hollow plastic articles
US3356199A (en) * 1966-02-23 1967-12-05 Friden Inc Printer having type disk rotatable in a plane parallel to the printing line
US3578129A (en) * 1967-08-30 1971-05-11 Mitsubishi Electric Corp Control device for positioning carriages of business machines
US3625330A (en) * 1969-04-21 1971-12-07 Addressograph Multigraph Registration alignment device for embossing machine
US3630334A (en) * 1969-05-09 1971-12-28 Marie Z Connolly Embossing apparatus for curved container surfaces
US3643771A (en) * 1969-07-16 1972-02-22 Kusutugu Takebe Medal stamping machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227454A (en) * 1978-08-22 1980-10-14 M. E. Cunningham, Company Hydraulically operated drum series printer
US4314505A (en) * 1978-10-13 1982-02-09 Columbia Marking Tools, Inc. Rotary wheel type marking head
US6095723A (en) * 1999-01-19 2000-08-01 Nemco Medical Engraving tool and method for forming
US20130025344A1 (en) * 2007-07-06 2013-01-31 Mettler-Toledo Ag Check weight, method and system to ensure traceability of same

Also Published As

Publication number Publication date
JPS4873898A (ru) 1973-10-05
HU173439B (hu) 1979-05-28
RO62032A (ru) 1977-09-15
DE2263701A1 (de) 1973-07-12
PL82174B1 (ru) 1975-10-31
FR2170628A5 (ru) 1973-09-14
AT323518B (de) 1975-07-10
JPS5611600B2 (ru) 1981-03-16
IT944460B (it) 1973-04-20
SU634646A3 (ru) 1978-11-25

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