US3294571A - Sheets of coated paper - Google Patents

Sheets of coated paper Download PDF

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Publication number
US3294571A
US3294571A US279843A US27984363A US3294571A US 3294571 A US3294571 A US 3294571A US 279843 A US279843 A US 279843A US 27984363 A US27984363 A US 27984363A US 3294571 A US3294571 A US 3294571A
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US
United States
Prior art keywords
layer
sheet
sheets
paper
recto
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Expired - Lifetime
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US279843A
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English (en)
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Ernst Marc Henri Marie
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Individual
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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
    • 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
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249982—With component specified as adhesive or bonding agent
    • 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
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249982—With component specified as adhesive or bonding agent
    • Y10T428/249985—Composition of adhesive or bonding component specified
    • 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
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987—With nonvoid component of specified composition
    • 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
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987—With nonvoid component of specified composition
    • Y10T428/249991—Synthetic resin or natural rubbers

Definitions

  • the present invention relates to sheets of coated paper for the simultaneous production, in superposition, of an original and a number of copies.
  • Sheets of paper have also been coated on the recto and the verso, so as to allow also the transfer of the inscribings made on the recto of a rst coated sheet on the recto of at least one other coated sheet placed underneath this first sheet; the layers coating respectively the recto and the verso of these known sheets have different chemical compositions selected so that the bringing together, produced by the inscribing pressure, of one of the constituent substances of the layer coating the verso of the first coated sheet on the one hand and of one of the constituent substances of the layer coating the recto of the sheet placed under the first sheet on the other hand, gives rise to a chemical reaction and to the local appearance of a colored spot on the second sheet which reproduces the inscribing made on the recto of the first sheet.
  • These coated sheets of paper of a known type present several drawbacks.
  • Sheets of paper are also known which ⁇ are coated on both their faces for the simultaneous production, in superposition, of an original and of multiple copies which, each, carry on their opposed faces, thin layers of two different types, the layer of the first type being selected so as toV be able to be locally transferred by the inscribing pressure on the layer of the second type of the sheet placed in contact with said layer of the first type.
  • the transferable layer which covers the verso of each sheet is a mixture of inorganic pigments and of synthetic binders which is frail and apt to stain the fingers or the sheet with which it is in contact.
  • the transferable layer covering the recto of each sheet includes a white coloring substance, for instance, a size color, a spirit color, a pastel, a.s.o.; this layer has thereby a dense structure, which does not facilitate its adherence to the not transferable layer of the second type, which covers the verso of each ICC sheet and is constituted by a sticky substance', the sensitiveness of coated sheets of paper of this type is consequently small.
  • a white coloring substance for instance, a size color, a spirit color, a pastel, a.s.o.
  • coated sheets of paper according to the invention are also coated on their opposed faces with thin layers of two different types, each layer of the first type being transferable upon a layer of the second type; nevertheless, they do not present any of the drawbacks of the previously mentioned known sheets. They are characterized in that their transferable layer is friable and has a microporous structure.
  • the layer of the second type, not transferable is slightly adhesive.
  • the layer of the second type, not transferable has the same microporous structure as the transferable layer but it has a better mechanical strength.
  • the copy by a transfer of matter made according to the invention is a purely mechanical operation based on a physical phenomenon, that is to say, the adhesion between the layer of the verso of the upper sheet and the layer of the recto of the lower sheet: this adhesion can result from a slight adhesiveness peculiar to the not transferable layer (first form of realization) or from an also microporous structure of the two layers (second form of realization); in this last case, the adhesion of said micro-y porous layers to each other results from their partial interpenetration, the friable transferable layer being, so to say,
  • FIGURES 1 and 2 of the annexed drawing are shown, in a transverse section, two sheets of paper coated according to the invention on their recto and their verso, these sheets having identical constitutions and being superposed so that the verso of the upper sheet I is in contact with the recto of the lower sheet II.
  • each sheet I, II is coated with a thin layer 3, 3' strong and adhering well to the paper 1, 1'.
  • the layer of the verso 3, 3' is made to be slightly adhesive while the layer 2, 2' of the recto of each sheet I, II is made so as to have a line porous structure; for instance, this layer 2 2', is constituted by a film of an organic resin, with the addition of an amorphous ller intended to make it friable: a film of an organic resin of this type, having a ne porous structure can be laid down on a body-paper, for instance according to one of the process descri'bed in the French patent entitled Fabrication of Coated Paper, applied for on September 9, 1961 under No. P.V. 872,478 and in its first additional certicate applied for on February 23, 1962 under No. P.V. 889,006.
  • this pressure suppresses the air interval which may exist between the sheets I, II, and which was illustrated in FIGURE 1 by the Ibroken line a-b: as a result, the pressure 5 applies the layer 3 of the verso of the upper sheet I on the broken -portion of the layer 2 of the recto of the lower sheet II: as this layer 3 is slightly adhesive, when the sheets I and II are separated from each other after the completion of the making of the document and of its copy, the broken fragments of the layer 2 of the recto of the lower sheet II remain adherent to the corresponding zone of the layer 3 of the verso of the upper sheet I: this results, on the one hand, from the fact that this layer 3 adhers strongly to the body-paper 1 of sheet I and, on the other hand, from the fact that the broken fragments of the layer 2' of the sheet II adhere but slightly to the body-paper 1' of this sheet II.
  • the inscribing pressure 5 is applied -by ⁇ a type of a typewriter, the portion of the layer 2' of the lower sheet II corresponding exactly to this type is drawn away by the layer 3 of the verso of the upper sheet I when this sheet is separated from the sheet II; this type appears then on the recto of the sheet II with a color which is the color of the body-paper 1', a color which has been selected as differing from the color of said layer of the recto 2'.
  • a thin layer of a coloring substance for instance of lamp black, is inserted between the body paper 1, 1', and the layer 2, 2', coating its recto; this layer is selected so that it adheres more to the body paper 1, 1', as to the layer 2, 2', and in any case, its color is to be different from the color of this layer.
  • the intercalated layer Iof coloring substance appears locally so as to reproduce the inscribings made on the recto of the upper sheet I.
  • each sheet I and II is essentially constituted by a sheet of body-paper, 1, 1', the verso of which is coated with a rst thin layer 4, 4', of a coloring substance which adheres slightly to the paper: this first thin layer,
  • each sheet I, II is coated with a single thin layer 3, 3', strong and adhering well to the body-paper 1, 1': this layer 3, 3', may be opaque and of a uniform color, ditering from the color of the coloring substance of the layer 4, 4', of the verso, but this layer 3, 3', of the recto, may be also transparent and in this case, the body-paper 1, 1', itself, must also have a uniform color, differing from the color of the coloring substance, of the layer 4, 4', coating its verso.
  • the layer of the recto 3, 3' is selected to be slightly adhesive while the outer layer 2, 2', of the verso of each sheet I, II, is selected to have a thin porous substance: for instance, this outer layer 2, 2', of the verso is constituted like the layer 2, 2', of the recto of the form of embodiment illustrated in FIGURE 1.
  • the hand-writing or type-writing instrument for instance the end of a pencil
  • the ⁇ ball of a stylograph or the type of a type-writer applies upon the recto of the upper sheet I a perpendicular pressure indicated by the arrow 5
  • a deposit of ink is produced on the resisting layer 3 coating said recto: after-drying, the deposit constitutes the original inscribing;
  • the pressure 5 is transmitted, through the paper 1 of the upper sheet 1 and through the layer of coloring substance 4 coating internally its verso, to the second layer 2 which coats it externally; as the layer 2 is friable, it breaks at the accurate place where the pressure 5 is applied.
  • this pressure suppresses the air interval which may exist between the sheets I, II, and which was illustrated in FIGURE 2 by the broken line a-b.
  • the pressure 5 applies the broken portion of the lower layer 2 of the sheet I upon the upper layer 3' of the sheet II; as this layer 3' is slightly adhesive, when the sheets I and II are separated from each other after the completion of the inscribing of the document and of its copy, the broken fragments of the layer 2 of the verso of the upper sheet I rernain adherent to the corresponding zone of the layer 3' of the recto of the lower sheet II; this results, on the one hand, from the fact that this layer 3' adheres strongly to the body-paper 1' of the sheet II and, on the other hand, from the fact that the broken fragments of the layer 2 of the sheet I have no connection with the body-paper 1 of this sheet I.
  • the portion of the layer 4 of the upper sheet I, which corresponds exactly to this type is drawn by the layer 2 on the layer 3' of the recto of the lower sheet II, when this sheet II is separated from the sheet I: this type appears then on the recto of sheet II with a color which is the color of the coloring substance of the layer 4 of the upper sheet I, this color having precisely been selected to differ from the color of the layer 3' of the recto of sheet II in the case when this sheet 3' is opaque and of the uniform color of the Ibodypaper 1 of said sheet II in the case when the layer 4' coating its verso is transparent.
  • the slightly adhesive layer, 2, 2', and the adhesive layer 3, 3', of each of the sheets of paper coated according to the invention are selected so as to have both a thin porous substance but the layer 3, 3', is selected to be also resistant While the layer 2, 2', is selected to be friable.
  • the inscribing pressure 5 brings about again a local break of the layer 2' of the lower sheet II (FIGURE 1) or of the layer 2 of the upper sheet I (FIGURE 2) and the adhesion of the corresponding fragments of matter to the layer 3 coating the verso of the upper sheet I or to the layer 3 coating the recto of the lower sheet II; nevertheless, as this last layer, 3 or 3', has a thin porous structure but is resistant, it is not broken, not even locally, by the pressure 5: this pressure 5 brings then only a partial penetration of the broken fragments of the layer 2 or 2' -of one of the sheets in supercial pores of the layer 3 or 3 of the other sheet.
  • One of the faces of a sheet of paper, gray or white, 1 is coated with an aqueous dispersion of lamp black with the addition of a damping product, at the rate of 1 to 1.5 gr. of dry product for one square meter of paper.
  • the drying of this dispersion gives a thin layer 4 of lamp black, slightly adhering to the paper 1.
  • This layer 4 can also be constituted by a colored pigment, deposited from an aqueous dispersion or by a film of black wax.
  • the substance of the layer 4 must only fulfill the following conditions, must be slightly adhesive to the paper 1, be able to produce a film just to allow the coating of a sheet of paper, but not to the extent that, in the process ofthe copying by a transfer, such as previously described, said layer 4 should be separated from the paper 1 in the same way as a film, that is to say by fragments having a large surface, particularly a surface greater than the surface of the point or the type which applies the inscribing pressure.
  • the layer 4, thus formed is then coated, after drying, with a solution of vinyl-chloroacetate in acetone, with the -addition of suitable amounts of an amorphous filler and of an alcohol which does not dissolve said vinyl-chloroacetate, for instance of isanol.
  • the composition of the solution can be, for instance, as follows After drying, the layer of lamp black 4 is coated by a white opaque film 2 of vinyl chloroacetate which has a thin .porous structure, made friablev by the amorphous filler and which adheres well to the layer of lamp black, 4, which it shelters in same time.
  • a film having a thin, porous and friable structure of this type can Ibe produced according to one of the processes described in the patent application No. P.V. 872,478 and the additional certificate No. P.V. 889,006, previously mentioned.
  • These known processes consist essentially in using a volatile solution of an organic compound to which was added a volatile solution unable to dissolve said organic compound but miscible with its solvent; the amount of the volatile, but not dissolving, substance is chosen with respect to the amount of solvent and to the respective eva-poration speeds so that, after the complete evaporation of the solvent, a suflicient amount of the non dissolving substance will remain to bring about the deposit of the organic compound by a flocculation.
  • the lms, particularly of organic resins, obtained according to the process, offer effectively a thin porous structure and it is possible to render them friable by the raddition to the initial solution of an amorphous filler.
  • the organic compound can be constituted by a cellulosic resin, for instance a cellulose ether or ester dissolved in acetone and to which is added for instance toluene which does not dissolve either the cellulose ether or ester. It can also be constituted Iby a vinylic resin, a condensation resin of the cyclohexanone, of the polystyrene, of theInventabic gum, a butadiene resin a.s.1o.
  • the other face of the sheet of paper I is coated with an aqueous dispersion of an acrylic resin, slightly plasticized, in an amount of 2 to 5 gr. of the dry product for one square meter of paper.
  • the drying of this dispersion brings about the formation of a ilm 3 which adheres well to the paper 1 and has a free surface slightly adhesive.
  • the layer 3 can also be obtained by depositing on the free face of the sheet of paper I a film of a varnish with a basis of organic slightly plastiiied resin (polyvinyl acetate, acrylic resin, shellac or a film of yadhesive wax, for instance doped with butyl-rubber, in an amount of 1 to- 3 gr. per square meter of paper.
  • a slightly plasticized organic resin such for instance as polyvinylchloroacetate or vinyl propionate
  • the layer 3 can also be obtained by depositing on the free face of the sheet of paper I a film of a varnish with a basis of organic slightly plastiiied resin (polyvinyl acetate, acrylic resin, shellac or a film of yadhesive wax, for instance doped with butyl-rubber, in an amount of 1 to- 3 gr. per square meter of paper.
  • the sheets of paper coated according to the invention allow the making of copies only when they are used in bundles of at least two identical sheets superposed so that the verso of each sheet is in contact with Ithe recto of another sheet: no transfer of an inscribing is possible when using two sheets of paper according to the invention applied one ⁇ on -the other by their versos or their rectos, or when using a single sheet of paper, coated according to the invention, applied upon any support.
  • each microporous coating l-ayer of a first kind is selected from the group consisting of cellulosic resins, vinylic resins, condensation resins of cycloheXanone, arabic gum and butadiene resins.
  • each adhesive coating layer of a second kind consists of a water-soluble substance selected from the group consisting of slightly plasticized ⁇ organic resins, varnishes containing slightly plasticized organic resins, and adhesive waxes.
  • each microporous coating layer of a first and of a second kind are selected from the group consisting of cellulosic resins, vinylic resins, condensation resins of cyclohexanone, arabic gum and butadiene resins.
  • each of the microporous, frangible coating layers of a first kind comprises further an amount of 4an amorphous filler not superior to 50% by weight.
  • each recto coating layer consisting essentially of a resin lm deposited to have a microporous structure and of an amorphous filler-widely distributed Ithroughout the said resin lilm in an amount sufficient to render the resin friable but not over 50% Weight, whereby each recto coating layer is locally broken into sharply outlined fragments by the inscribing pressure, an intermediate thin layer of a coloring substance being disposed on the recto of each sheet, under its microporous recto coating layer, this intermediate layer having a color different from that of said recto coating layer and being deposited to adhere more strongly to the sheet than to its recto coating
  • coated sheets of claim 8 in which the intermediate layer disposed on the recto of each sheet under its microporous recto coating layer, consists of a coloring substance selected from the group consisting of colored pigments and black wax.
  • each verso coating layer consisting essentially of a resin film deposited to have a microporous structure fand of an amorphous filler widely distributed throughout the said resin film in an amount sufficient t-o render the resin friable but not over 50% by weight, whereby each ,verso coating layer is locally broken into sharply outlined fragments by the inscribing pressure, an intermediate thin layer of a coloring substance being disposed on the verso Uof each sheet under its microporous verso coating layer, said intermediate layer having a color different from that of the recto of each coated sheet and being deposited to adhere less strongly to the sheet than to its verso coating layer, whereas each recto coating layer

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US279843A 1962-05-18 1963-05-13 Sheets of coated paper Expired - Lifetime US3294571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR898028A FR1388612A (fr) 1962-05-18 1962-05-18 Feuilles de papier enduites, notamment pour la polycopie

Publications (1)

Publication Number Publication Date
US3294571A true US3294571A (en) 1966-12-27

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Application Number Title Priority Date Filing Date
US279843A Expired - Lifetime US3294571A (en) 1962-05-18 1963-05-13 Sheets of coated paper

Country Status (7)

Country Link
US (1) US3294571A (enrdf_load_stackoverflow)
BE (1) BE631747A (enrdf_load_stackoverflow)
CH (1) CH383755A (enrdf_load_stackoverflow)
FR (1) FR1388612A (enrdf_load_stackoverflow)
GB (1) GB1035498A (enrdf_load_stackoverflow)
LU (1) LU43644A1 (enrdf_load_stackoverflow)
NL (1) NL292950A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404021A (en) * 1964-07-30 1968-10-01 Columbia Ribbon & Carbon Transfer elements and method of making the same
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
US3458339A (en) * 1965-10-15 1969-07-29 Columbia Ribbon Carbon Mfg Transfer sheets for duplicating
US3635747A (en) * 1969-07-11 1972-01-18 Standard Register Co Donor-receptor copy paper
US5383806A (en) * 1993-03-30 1995-01-24 Continental American Corporation Inflatable balloons with anti-blooming and anti-fogging coatings

Citations (10)

* 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
US2313810A (en) * 1941-07-08 1943-03-16 Harold R Dalton Copying and recording medium
US2318096A (en) * 1940-09-04 1943-05-04 All Purpose Gold Corp Transfer sheet
US2665262A (en) * 1950-08-04 1954-01-05 Interchem Corp Coating compositions for recording media
US2898112A (en) * 1954-09-01 1959-08-04 Dictaphone Corp Indicator slips with blushed lacquer coating
DE1074604B (de) * 1957-10-24 1960-02-04 Paul Meyer Dortmund-Kirchhorde Durchschreibepapier
GB901028A (en) * 1959-03-02 1962-07-11 Ancar A G Improvements in and relating to sheets or foils provided with a reproductive layer
US3111421A (en) * 1961-04-27 1963-11-19 Columbia Ribbon & Carbon Method for preparing pressure-sensitive duplicating elements

Patent Citations (10)

* 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
US2318096A (en) * 1940-09-04 1943-05-04 All Purpose Gold Corp Transfer sheet
US2313810A (en) * 1941-07-08 1943-03-16 Harold R Dalton Copying and recording medium
US2665262A (en) * 1950-08-04 1954-01-05 Interchem Corp Coating compositions for recording media
US2898112A (en) * 1954-09-01 1959-08-04 Dictaphone Corp Indicator slips with blushed lacquer coating
DE1074604B (de) * 1957-10-24 1960-02-04 Paul Meyer Dortmund-Kirchhorde Durchschreibepapier
GB901028A (en) * 1959-03-02 1962-07-11 Ancar A G Improvements in and relating to sheets or foils provided with a reproductive layer
US3111421A (en) * 1961-04-27 1963-11-19 Columbia Ribbon & Carbon Method for preparing pressure-sensitive duplicating elements

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404021A (en) * 1964-07-30 1968-10-01 Columbia Ribbon & Carbon Transfer elements and method of making the same
US3458339A (en) * 1965-10-15 1969-07-29 Columbia Ribbon Carbon Mfg Transfer sheets for duplicating
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
US3635747A (en) * 1969-07-11 1972-01-18 Standard Register Co Donor-receptor copy paper
US5383806A (en) * 1993-03-30 1995-01-24 Continental American Corporation Inflatable balloons with anti-blooming and anti-fogging coatings

Also Published As

Publication number Publication date
LU43644A1 (enrdf_load_stackoverflow) 1963-06-27
CH383755A (fr) 1964-10-31
NL292950A (enrdf_load_stackoverflow) 1900-01-01
BE631747A (enrdf_load_stackoverflow) 1900-01-01
GB1035498A (en) 1966-07-06
FR1388612A (fr) 1965-02-12

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