US3226134A - Sets of reproduction transfer sheets - Google Patents

Sets of reproduction transfer sheets Download PDF

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Publication number
US3226134A
US3226134A US24346662A US3226134A US 3226134 A US3226134 A US 3226134A US 24346662 A US24346662 A US 24346662A US 3226134 A US3226134 A US 3226134A
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US
United States
Prior art keywords
layer
sheet
colour
writing
covering layer
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
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English (en)
Inventor
Breidthardt Edgar
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.)
Ancar AG
Original Assignee
Ancar AG
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Filing date
Publication date
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Publication of US3226134A publication Critical patent/US3226134A/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/10—Duplicating or marking methods; Sheet materials for use therein by using carbon paper or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L1/00—Devices for performing operations in connection with manifolding by means of pressure-sensitive layers or intermediaries, e.g. carbons; Accessories for manifolding purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L1/00—Devices for performing operations in connection with manifolding by means of pressure-sensitive layers or intermediaries, e.g. carbons; Accessories for manifolding purposes
    • B41L1/20—Manifolding assemblies, e.g. book-like assemblies
    • B41L1/34—Manifolding assemblies, e.g. book-like assemblies for making masters for hectographic duplicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L1/00—Devices for performing operations in connection with manifolding by means of pressure-sensitive layers or intermediaries, e.g. carbons; Accessories for manifolding purposes
    • B41L1/20—Manifolding assemblies, e.g. book-like assemblies
    • B41L1/36—Manifolding assemblies, e.g. book-like assemblies with pressure-sensitive layers or coating other than carbon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y10T428/31899—Addition polymer of hydrocarbon[s] only
    • Y10T428/31902—Monoethylenically unsaturated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y10T428/31906—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y10T428/3192—Next to vinyl or vinylidene chloride polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31928—Ester, halide or nitrile of addition polymer

Definitions

  • Copying processes are already known in which copying papers, for example carbon papers of various kinds, hectograph paper and the like, are used, whose reverse sides are provided with a specially hard ink layer or with a resin coating over the usual ink layer and therefore do not transfer any copies on to ordinary writing paper.
  • These copying papers are intended to be used in conjunction with paper whose surface carries a wax coating which is intended to receive the copy.
  • Such a process involves the use of the ordinary carbon paper ink mixtures which are only slightly suitable for the said purpose.
  • Transfer sheets are also known for multiple reproduction by the pressure of the writing, in which a transfer composition is applied to the reverse side -of the writing sheet and a similar or contrasting composition is applied on the upper surface of the next sheet.
  • the writing is supposed to be transferred without using special intermediate layers, for instance sheets of carbon paper, on to the top surface of the sheet lying below.
  • the said process is in fact only a very primitive one, as on the reverse side of the original writing sheet clay, chalk or a similar material is applied in powder form and the surface of the second sheet is provided with a darker coating of a contrasting colour.
  • a layer so formed is not very stable; for instance it is exposed to attack by moisture, under the influence of which it alters.
  • a kind of paper has also been described which rst im- -parts copies by heating and pressure, after which any normal kind of paper is used for taking the copies.
  • a heat-active ink coating is softened by raising the temperature and transferred by pressure in the form of a copy.
  • the kind of heat-active substances which are supposed to be used are resins, synthetic plastic substances and the like. To these are further added plasticizers and solvents, while printing inks, pigments and methyl violet are used as colouring agent.
  • Such a process is extraordinarily laborious in actual practice, as for example the material used for transferring the writing must first be made capable of transfer action by raising the temperature.
  • a carbon paper is also known in which an ink layer kept soft, whose composition is similar to that of a carbon paper ink, is bonded by means of film-forming synthetic plastic substances. By exerting a writing pressure this ink layer is acted on, so that copies are transferred, for the receipt -of which likewise an ordinary paper is used.
  • constituents for the ink layer of the original sheet synthetic plastic substances piasticizers, solvents and the usual carbon paper ink substances are used. In this process there are therefore two constituents in action, one being a conveyor means or transfer means for the ink, and further an essentially liquid ink composition, which is mechanically -held fast in the conveyor means.
  • a copying process for transferring typewriting and handwriting from sheets or foils and also a writing and transfer sheet suitable for performing this process is proposed, which, apart from the continually sought properties, which in practice however particularly when using the usual carbon paper inks are only attainable with difficulty, of xed adhesion and resistance to rubbing, offers the advantage of special cheapness of material and a particularly prolific yield of sheets with ⁇ sharply defined lettering.
  • white sheets are used, not differing in appearance from ordinary paper sheets, it is made possible to transfer a writing appearing coloured, for example black, on the receiving sheet, in the sharpest definition even with a large nurnber of copies.
  • a sheet suitable for writing on and for transfer purposes is produced by providing a white or lightly coloured paper sheet on its upper side, that is, the side turned towards the writing instrument, with an ink layer, consisting for example of a polyvinyl acetate or a high-acetylised compound derived from such an acetate in a strongly coloured condition, for example black, by painting on or impregnating.
  • an ink layer consisting for example of a polyvinyl acetate or a high-acetylised compound derived from such an acetate in a strongly coloured condition, for example black
  • This ink layer is covered with a white or coloured layer c011- trasting with it, fast to handling or rubbing, consisting ⁇ of a polyvinyl chloride, to which if necessary there can be added to deepen the white or coloured colour tone such suitable substances as titanium dioxide, aluminium spar, silicon spar and also dissolved or pigmented colouring agents.
  • the white or lightly coloured paper sheet receives a coating consisting of a polyethylene coloured white for example, of given molecular range, preferably of a molecular weight from 2000 to 5000.
  • Polyethylenes of this molecular range with a melting point of about to 110 C., preferably 97 to 102 C. have proved to be particularly suitable, the hardness being about 0.3 to 0.5 and the density about 0.92; a high viscosity up to about 4000 cps. with a ow point of C. is preferably to be kept in View.
  • the above mentioned properties make possible a particularly advantageous treatment of the polyethylenes in question and give a particularly satisfactory and sharp image of the writing when a large number of copies is taken.
  • the writing pressure results in a removal of the comparatively brittle polyvinyl covering layer of the receiving sheet so that in the places where this covering layer is removed the strong colouration of the acetate or acetal layer lying underneath becomes visible.
  • the rst sheet of a writing pad can be formed on the front side without the two layers in accordance with the invention, while the last sheet on the reverse side can remain untreated.
  • a raw material of suitable quality and weight for example a 20 to 60 gram paper, which may be sized or unsized, but is preferably translucent, is coated or impregnated on the upper side with the aforesaid acetates or acetals.
  • the impregnation or coating may be applied by means of a solution of the acetate or acetal in question.
  • this colour coating After this colour coating has dried, the white or coloured covering layer is applied.
  • the thickness of this covering layer may be about 2 to 6 grams per square metre.
  • the white or coloured reverse layer consisting of a polyethylene or polyethylene mixture, for example an A-C-polyethylene, applied.
  • the thickness of the reverse layer may be suitably about 3 to 7 grams per square metre.
  • FIGURE 1 shows diagrammatically and in section a copying sheet embodying the invention
  • FIGURE 2 shows in diagrammatic representation a writing pad consisting of three superimposed writing sheets in accordance with FIGURE l, and
  • FIGURE 3 shows diagrammatically a telewriter roll with four superimposed copying papers formed as in FIG- URE 1, which are rolled up in roll form.
  • the reference numeral 1 designates a sheet of white or lightly coloured paper.
  • the sheet is covered on the side turned towards the typewriter or pen with a coloured layer 2, for example black, consisting of polyvinyl acetate.
  • a white covering layer 3 of polyvinyl chloride, while the underside of the paper sheet 1 is provided with a layer 4 consisting of a polyethylene with a molecular range of about 2500.
  • FIGURE 2 like reference numerals indicate the same components as in FIGURE 1.
  • three sheets of paper 1a, 1b, 1c formed as in FIGURE 1 are superimposed in such a way that the brittle White covering layer 3a, 3b, 3c of the colour layers 2a, 2b, 2c in each case is applied against the polyethylene layer 4a, 4b, 4c of the superimposed sheet.
  • FIGURE 3 four sheets 5, 6, 7, 8 of the kind shown in FIGURE 1 are superimposed and rolled up in the form of a roll 9, from which they are gradually drawn off in the course of the writing.
  • Polyethylenes of the abovementioned molecular range and the other characteristic properties have been found to be particularly suitable as materials for the reverse coating of papers or foils.
  • Certain synthetic resins have also been found to be suitable for transfer of writing in accordance with the invention, for example resins with a chlorodiphenyl or chloro-rubber base, light-resistant phenoland aldehyde-free modified resin esters and their variants, and nitro-compounds of polyvinyl methyl ether or polyvinyl ethyl ether.
  • the proposed construction of copying sheets offers, by contrast with the usual copying processes, the advantage of dispensing with separate carbon papers or copying papers. This makes itself particularly felt in writing sets of individual forms or endless forms, for example fan-folded sets or telewriter rolls, as here both the insertion of the carbon papers and their removal after the writing is iinished, is completely dispensed with.
  • the coating can be applied in the ordinary way, for example by painting on, spraying on, rolling on and so on, on the appropriate side of the foils, for example the sheets of paper.
  • the layers may be full surface, in strips as desired, or may be applied so as to leave gaps. Furthermore, undesired copyings and imprints can be prevented at given places, by covering, for example at will, the front or reverse side with suitable means, for instance by pressing over.
  • compositions for ⁇ forming the layer 2 in FIG- URE 1 are:
  • Example I Parts Polyvinyl acetate 10 to 25 Pigment colouring matter 5 to 20 Ethyl alcohol to 200
  • Example II Polyvinyl acetal 8 to 15 Pigment colouring matter 5 to 20 Ethyl alcohol 85 to 200
  • Example III Polyvinyl acetate 7 to 20 Polyvinyl acetal 8 to 15 Pigment colouring matter 5 to 20 Ethyl alcohol 80 to 200
  • Suitable compositions for forming the layer 3 in FIG- URE 1 are:
  • Example IV Parts Polyvinyl chloride 10 to 40 Titanium dioxide 15 to 60 Aluminum silicate l0 to 30 H2O 100 to 300
  • Example V Polyvinyl chloride 10 to 40 Titanium dioxide 5 to 30 Silicon spar 5 to 20 Aluminum spar 10 to 30 H2O 100 to 300
  • the mixtures of Examples IV and V may also be produced on a basis of ethyl alcohol.
  • Suitable compositions for forming the layer 4 in FIG- URE 1 are:
  • Example VI Parts Polyethylene, molecular weight 200G-5000 lOto 40 Chlorodiphenyl resin 25 to 40 Polyvinyl methyl ether 30 to 60
  • Example VII Polyethylene, molecular weight 20005000 70 to 90 Polyvinyl ethyl ether 15 to 40 Rosin ester resin 15 to 35 I claim:
  • lifting layer means for lifting olf and holding fast a color covering layer on an adjacent sheet, the functions of lifting off and holding fast being accomplished in only those areas where writing pressure occurs, said lifting layer being comprised of polyethylene having a molecular weight of 2000-5000 and a melting point of -110 C.;
  • said covering layer having a contrasting color compared to said color layer, being comprised of an organic polymeric film of polyvinyl chloride and having a preferential affinity for a lifting layer in those areas where writing pressure is applied.

Landscapes

  • Color Printing (AREA)
  • Paper (AREA)
  • Duplication Or Marking (AREA)
  • Laminated Bodies (AREA)
US24346662 1961-12-14 1962-12-10 Sets of reproduction transfer sheets Expired - Lifetime US3226134A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1961R0031693 DE1216336C2 (de) 1961-12-14 1961-12-14 Durchschreibeverfahren zur UEbertragung von Maschinen- und Handschrift von Blaettern oder Folien und Beschriftungs- sowie UEbertragungsblatt zu dessen Ausfuehrung
DER0041276 1965-08-09

Publications (1)

Publication Number Publication Date
US3226134A true US3226134A (en) 1965-12-28

Family

ID=25991526

Family Applications (1)

Application Number Title Priority Date Filing Date
US24346662 Expired - Lifetime US3226134A (en) 1961-12-14 1962-12-10 Sets of reproduction transfer sheets

Country Status (7)

Country Link
US (1) US3226134A (en, 2012)
BE (1) BE626078A (en, 2012)
CH (2) CH437377A (en, 2012)
DE (2) DE1216336C2 (en, 2012)
GB (2) GB1025757A (en, 2012)
NL (3) NL6610780A (en, 2012)
SE (1) SE341665B (en, 2012)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410712A (en) * 1965-10-19 1968-11-12 Renker Belipa Gmbh Pressure responsive transfer system and process of making
US3411935A (en) * 1965-10-22 1968-11-19 Renker Belipa Gmbh Pressure-sensitive transfer elements and method of producing same
US3505955A (en) * 1966-01-17 1970-04-14 Gerhard Ritzerfeld Method and arrangement for producing printing forms
US3545999A (en) * 1966-12-16 1970-12-08 Datacopy Ltd Transfer sheet system
FR2387794A1 (fr) * 1977-04-20 1978-11-17 Data Card Uk Ltd Matrice pour impression hectographique et son procede de realisation
DE3133398A1 (de) * 1980-08-28 1982-09-16 Mitsubishi Denki K.K., Tokyo Folienanordnung zur farbuebertragung mittels waerme
US4512595A (en) * 1982-09-30 1985-04-23 Rand Mcnally & Company Tamper-resisting negotiable instruments containing a transparent verifying web
US4611826A (en) * 1982-09-30 1986-09-16 Rand Mcnally & Co. Anti-fraud credit card transaction formset
ES2199089A1 (es) * 2003-09-03 2004-02-01 Signe Sa Papel autocopiativo de seguridad.

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US627229A (en) * 1899-06-20 Manifqlding-sheet
US680637A (en) * 1899-05-17 1901-08-13 Horace P Brown Manifolding-sheet.
US1845568A (en) * 1928-04-27 1932-02-16 Ervin E Strawn Copying agency
US2035768A (en) * 1933-02-20 1936-03-31 Sherman Transfer paper and method of making same
US2153553A (en) * 1936-02-04 1939-04-11 Ici Ltd Polymerization of olefins
GB549887A (en) * 1940-07-01 1942-12-11 Rudolf Waelti Improvements in, and relating to the manufacture of, copying paper
US2318096A (en) * 1940-09-04 1943-05-04 All Purpose Gold Corp Transfer sheet
US2508725A (en) * 1945-01-13 1950-05-23 Columbia Ribbon & Carbon Transfer medium
US2626884A (en) * 1946-06-17 1953-01-27 William M Ewing Carbon paper
DE1067680B (de) * 1950-05-11 1959-10-22 Pelikan Werke Wagner Guenther Im Gebrauch lichtundurchlaessig bleibendes Kohlepapier
DE1074604B (de) * 1957-10-24 1960-02-04 Paul Meyer Dortmund-Kirchhorde Durchschreibepapier
US2924538A (en) * 1956-04-16 1960-02-09 Allied Chem Dense papers and process for preparing them
US2984342A (en) * 1958-11-24 1961-05-16 Crown Zellerbach Corp Heat sealable label roll and method of making the same

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US627229A (en) * 1899-06-20 Manifqlding-sheet
US680637A (en) * 1899-05-17 1901-08-13 Horace P Brown Manifolding-sheet.
US1845568A (en) * 1928-04-27 1932-02-16 Ervin E Strawn Copying agency
US2035768A (en) * 1933-02-20 1936-03-31 Sherman Transfer paper and method of making same
US2153553A (en) * 1936-02-04 1939-04-11 Ici Ltd Polymerization of olefins
GB549887A (en) * 1940-07-01 1942-12-11 Rudolf Waelti Improvements in, and relating to the manufacture of, copying paper
US2318096A (en) * 1940-09-04 1943-05-04 All Purpose Gold Corp Transfer sheet
US2508725A (en) * 1945-01-13 1950-05-23 Columbia Ribbon & Carbon Transfer medium
US2626884A (en) * 1946-06-17 1953-01-27 William M Ewing Carbon paper
DE1067680B (de) * 1950-05-11 1959-10-22 Pelikan Werke Wagner Guenther Im Gebrauch lichtundurchlaessig bleibendes Kohlepapier
US2924538A (en) * 1956-04-16 1960-02-09 Allied Chem Dense papers and process for preparing them
DE1074604B (de) * 1957-10-24 1960-02-04 Paul Meyer Dortmund-Kirchhorde Durchschreibepapier
US2984342A (en) * 1958-11-24 1961-05-16 Crown Zellerbach Corp Heat sealable label roll and method of making the same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410712A (en) * 1965-10-19 1968-11-12 Renker Belipa Gmbh Pressure responsive transfer system and process of making
US3411935A (en) * 1965-10-22 1968-11-19 Renker Belipa Gmbh Pressure-sensitive transfer elements and method of producing same
US3505955A (en) * 1966-01-17 1970-04-14 Gerhard Ritzerfeld Method and arrangement for producing printing forms
US3545999A (en) * 1966-12-16 1970-12-08 Datacopy Ltd Transfer sheet system
FR2387794A1 (fr) * 1977-04-20 1978-11-17 Data Card Uk Ltd Matrice pour impression hectographique et son procede de realisation
DE3133398A1 (de) * 1980-08-28 1982-09-16 Mitsubishi Denki K.K., Tokyo Folienanordnung zur farbuebertragung mittels waerme
US4512595A (en) * 1982-09-30 1985-04-23 Rand Mcnally & Company Tamper-resisting negotiable instruments containing a transparent verifying web
US4611826A (en) * 1982-09-30 1986-09-16 Rand Mcnally & Co. Anti-fraud credit card transaction formset
ES2199089A1 (es) * 2003-09-03 2004-02-01 Signe Sa Papel autocopiativo de seguridad.
ES2199089B1 (es) * 2003-09-03 2005-08-16 Signe, S.A. Papel autocopiativo de seguridad.

Also Published As

Publication number Publication date
DE1546762A1 (de) 1970-10-22
NL6610780A (en, 2012) 1967-02-10
CH437377A (de) 1967-06-15
DE1546762C3 (de) 1975-06-12
DE1216336B (de) 1966-05-12
CH470267A (de) 1969-03-31
GB1025757A (en) 1966-04-14
GB1162213A (en) 1969-08-20
DE1216336C2 (de) 1973-09-06
NL286218A (en, 2012) 1900-01-01
SE341665B (en, 2012) 1972-01-10
DE1546762B2 (de) 1974-08-01
NL131661C (en, 2012) 1900-01-01
BE626078A (en, 2012) 1900-01-01

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