DE597466C - Composite light rubber sheet - Google Patents

Composite light rubber sheet

Info

Publication number
DE597466C
DE597466C DE1930597466D DE597466DD DE597466C DE 597466 C DE597466 C DE 597466C DE 1930597466 D DE1930597466 D DE 1930597466D DE 597466D D DE597466D D DE 597466DD DE 597466 C DE597466 C DE 597466C
Authority
DE
Germany
Prior art keywords
rubber
hard rubber
fabric
rubber sheet
composite light
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
Application number
DE1930597466D
Other languages
German (de)
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.)
Dunlop Rubber Co Ltd
Original Assignee
Dunlop Rubber Co Ltd
Anode Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dunlop Rubber Co Ltd, Anode Rubber Co Ltd filed Critical Dunlop Rubber Co Ltd
Application granted granted Critical
Publication of DE597466C publication Critical patent/DE597466C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B29C44/5681—Covering the foamed object with, e.g. a lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/06—Making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1209—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements by impregnating a preformed part, e.g. a porous lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/10—Layered products comprising a layer of natural or synthetic rubber next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B32B2260/023—Two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/048—Natural or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/02—Cellular or porous
    • B32B2305/022—Foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/22—Natural rubber
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)

Description

Zusammengesetzte Leichtkautschukplatte Gegenstand der Erfindung ist eine zusammengesetzte Leichtkautschukplatte, die aus einer aus natürlichen oder künstlichen wässerigen Kautschukdispersionen hergestellten Mittelschicht aus schwammförmigem Hartgummi und Deckschichten aus Metall, mit Hartgummi überzogenem Metall, Hartgummi, Ballonstoff oder imprägniertem Gewebe u. dgl. besteht.Composite lightweight rubber sheet is the subject of the invention a composite lightweight rubber sheet made from one of natural or Artificial aqueous rubber dispersions made from a middle layer of spongy Hard rubber and metal coverings, metal covered with hard rubber, hard rubber, Balloon fabric or impregnated fabric and the like.

Es ist bereits bekannt, aus mastizierter, mineralisierter Kautschukmischung oder aus Kautschukmilch Schwamm- oder Schaumkautschuk herzustellen und die erhaltenen porösen Massen zu verfestigen. Es ist bereits auch vorgeschlagen worden, derartige poröse Massen als Diaphragmen zu verwenden und zu Platten für Wärme- und Kälteisolation o. dgl. und auch zu Korkersatz zu verarbeiten. Nicht bekanntgeworden ist jedoch bisher, daß der aus wässerigen Dispersionen erhaltene Schwamm- oder Schaumkautschuk unmittelbar zu den obengenannten zusammengesetzten Leichtkautschukplatten verarbeitet werden kann. Diese Platten haben aber, da sie sehr leicht sind, für viele Anwendungszwecke sehr wesentliche Vorteile.It is already known from masticated, mineralized rubber mixture or to produce sponge or foam rubber from rubber milk and the obtained to solidify porous masses. It has also been suggested that such porous masses can be used as diaphragms and as plates for heat and cold insulation o. The like. And also to be processed into cork substitute. However, it has not become known so far that the sponge or foam rubber obtained from aqueous dispersions processed directly into the above-mentioned composite lightweight rubber sheets can be. However, since they are very light, these plates have many uses very substantial advantages.

So können Leichtkautschukplatten gemäß der Erfindung mit Vorteil beispielsweise zum Bespannen der Flügel oder zum Verkleiden des Rumpfes von Flugzeugen oder beim -Bau von Rennbooten u. dgl. Verwendung finden, denn das Material ist leicht, fest und wasserdicht.For example, light rubber sheets according to the invention can advantageously be used for covering the wings or for cladding the fuselage of aircraft or for -Building racing boats and the like find use, because the material is light, strong and waterproof.

Für das Herstellen der schwammförmigen Mittelschicht aus Hartgummi werden die gegebenenfalls durch Zusatzstoffe wärmeempfindlich gemachten Kautschukdispersionen in an sich bekannter Weise in einen stabilen Schaum übergeführt, und dieser Schaum wird dann, nachdem er in die gewünschte Form gebracht worden ist, durch Wärme, Koagulation oder Verdampfung des Wassers verfestigt. Die so erhaltene Schaumschicht wird dann durch wasserdichte Deckschichten der genannten Art abgedeckt und mit diesen durch Vulkanisation verbunden.For producing the spongy middle layer made of hard rubber the rubber dispersions, which may have been made heat-sensitive by additives converted into a stable foam in a manner known per se, and this foam is then, after it has been brought into the desired shape, by means of heat, coagulation solidifies or evaporation of the water. The foam layer thus obtained is then covered by waterproof cover layers of the type mentioned and with these through Connected to vulcanization.

An Stelle der Verwendung von Kautschukdispersionen können natürlich auch solche aus Guttapercha, Balata oder ähnlichen Pflanzenharzen benutzt werden, und es können ihnen auch die üblichen Zusatzstoffe beigemischt werden.Instead of using rubber dispersions, you can of course also those made from gutta-percha, balata or similar vegetable resins are used, and the usual additives can also be added to them.

Da Hartgummi bei der Siedetemperatur des Wassers erweicht, kann den erhaltenen Platten bei dieser Temperatur leicht die jeweils erforderliche Form gegeben werden. Eine beispielsweise Ausführungsform _ der Erfindung ist die folgende: Eine Hartgummimischung der folgenden Zusammensetzung Gewichts- teile Kautschuk (in Form von Kaut- schukmilch) ............... 6o,5 Schwefel .................... 29,5 Zinkdiaethyldithiocarbamat ... o,6 Mineralöl ................... 6,8 Zinkoxyd ................... 0,5 Lampenruß ................. z,o ölsaure ...:................. 0,1 Casein ...................... o,4 kaustische Pottasche ......... o,6 wird in die Form eines Rahmes gebracht, der genügend v iscos und konzentriert ist, damit das Abscheiden der Zusatzstoffe verhindert wird. Zu dem kalten Rahm «-erden in bekannter Weise 1,5 Teile Ammoniumoleat als Schaummittel zugesetzt, und das Gemisch wird dann zu einem steifen Schaum geschlagen. Wenn ein Schaum mit einem ausreichend niedrigen spezifischen Gewicht erzielt worden ist, werden i,5 Teile kieselfluorwasserstoffsaures Natrium (auf das trockene Geinisch berechnet) vorzugsweise als eine 2o°/oige Emulsion zugesetzt. Nachdem die Masse etwa noch eine Minute weitergeschlagen worden ist, wird der Schaum ausgegossen und in der Kälte in Trögen zum Erstarren gebracht. t'nmittelbar nachdem sich der Schaum vollständig verfestigt hat, wird er kurze Zeit mit Dampf behandelt, aus den flachen Trögen herausgenommen und sorgfältig getrocknet.Since hard rubber softens at the boiling point of water, the sheets obtained can easily be given the required shape at this temperature. An exemplary embodiment of the invention is as follows: A hard rubber mixture of the following composition Weight share Rubber (in the form of schukmilch) ............... 6o, 5 Sulfur .................... 29.5 Zinc diethyldithiocarbamate ... o, 6 Mineral oil ................... 6.8 Zinc oxide ................... 0.5 Lamp soot ................. z, o oleic acid ...: ................. 0.1 Casein ...................... o, 4 caustic potash ......... o, 6 is made in the form of a cream that is sufficiently viscous and concentrated to prevent the additives from separating out. In a known manner, 1.5 parts of ammonium oleate are added to the cold cream earth as a foaming agent, and the mixture is then whipped to a stiff foam. When a foam with a sufficiently low specific gravity has been obtained, 1.5 parts of silicofluoric acid sodium (calculated on the dry mixture) are preferably added as a 20% emulsion. After the mass has been beaten for another minute, the foam is poured out and allowed to solidify in troughs in the cold. Immediately after the foam has completely solidified, it is treated with steam for a short time, removed from the shallow troughs and carefully dried.

Mit derselben Kautschukmilchmischung wird auch ein Gewebe imprägniert und dann getrocknet.A fabric is also impregnated with the same rubber milk mixture and then dried.

Die Leichtkautschukplatte wird nun zusammengesetzt, indem die Platten aus dem Schwammkautschuk mit dem imprägnierten Gewebe als Deckschicht verbunden werden, wobei dasselbe Gemisch, das zum Imprägnieren des Gewebes angewendet worden ist, als Bindemittel benutzt wird. Nach Belieben kann auch das Gemisch, das zum Verbinden der Schwammkautschukplatte mit dem imprägnierten Gewebe verwendet worden ist, eingedickt werden. Die L eichtkautschukplatte kann in Jeder beliebigen Dicke hergestellt werden, indem abwechselnd Schichten aus Schwammkautschuk und imprägniertem Gewebe verbunden werden. Die so zusammengesetzte Platte wird dann unter Druck behandelt und vulkanisiert, wobei eine Kompression von etwa 30 % durchgeführt wird, bis das Produkt die verlangten Eigenschaften hinsichtlich der Festigkeit und Härte aufweist. Es wurden so Produkte mit einem spezifischen Gewicht von o,4 bis o,5 erhalten. Produkte mit einem spezifischen Gewicht von 0,7 bis o,8 haben eine sehr gute mechanische Festigkeit.The light rubber sheet is now assembled by joining the sheets of sponge rubber with the impregnated fabric as a cover layer, using the same mixture that was used to impregnate the fabric as a binding agent. If desired, the mixture which has been used to bond the sponge rubber sheet to the impregnated fabric can also be thickened. The light rubber sheet can be produced in any thickness by alternately connecting layers of sponge rubber and impregnated fabric. The panel thus assembled is then treated under pressure and vulcanized, with a compression of about 30 % being carried out, until the product has the required properties in terms of strength and hardness. Products with a specific weight of 0.4 to 0.5 were obtained in this way. Products with a specific weight of 0.7 to 0.8 have very good mechanical strength.

Eine andere Herstellungsweise der zusammengesetzten Leichtkautschukplatte ist die folgende: Der wie oben beschrieben erhaltene Hartgummischaum wird in dünner Schicht auf lange Tuchrollen aufgestrichen; der Schaum haftet nach dem Koagulieren und Trocknen fest auf dem imprägnierten Gewebe. Die Platten werden nun in der Weise hergestellt, ,daß'zwei Tuchstreifen mit der daraufsitzenden Kautschukmischung, gegebenenfalls unter Verwendung einer Zwischenschicht aus einer Kautschukmilchmischung als Bindemittel, verbunden werden; die so hergestellte Platte wird dann unter Druck vulkanisiert.Another way of manufacturing the composite lightweight rubber sheet is as follows: The hard rubber foam obtained as described above becomes thinner Layer spread on long rolls of cloth; the foam adheres after coagulation and drying firmly on the impregnated fabric. The panels are now in the way produced that'zwei strips of cloth with the rubber mixture sitting on them, if necessary using an intermediate layer of a rubber milk mixture as a binder, get connected; the plate thus produced is then vulcanized under pressure.

Claims (1)

PATENTANSPRÜCHE: r. Zusammengesetzte Leichtkautschukplatte, dadurch gekennzeichnet, daß sie aus einer gegebenenfalls mehrteiligen, in an sich bekannter Weise aus natürlichen oder künstlichen wässerigen Kautschukdispersionen hergestellten Mittelschicht aus schwammförmigem Hartgummi besteht, die beiderseitig mit Schichten aus Metall, mit Hartgummi überzogenem Metall, mit Gewebe verstärktem Hartgummi, mit Hartgummi imprägniertem Gewebe, Hartgummi, Ballonstoff o. dgl. bedeckt und mit diesen Deckschichten gegebenenfalls durch Vulkanisation vereinigt ist. z. Verfahren nach Anspruch r, dadurch gekennzeichnet, daß die in bekannter Weise zu Schaum geschlagenen Kautschukdispersionen unmittelbar auf die als Deckmaterial dienenden Stoffe, wie z. B. Gewebe, aufgestrichen und verfestigt werden und daß dann zwei derartige Halbplatten, gegebenenfalls unter Verwendung einer Kautschukmilchmischung als Bindemittel, miteinander verbunden werden und die Platte dann in bekannter Weise vulkanisiert wird.PATENT CLAIMS: r. Composite light rubber sheet, thereby characterized in that it consists of an optionally multi-part, in per se known Made from natural or artificial aqueous rubber dispersions Middle layer consists of sponge-shaped hard rubber, both sides with layers made of metal, metal coated with hard rubber, hard rubber reinforced with fabric, Fabric impregnated with hard rubber, hard rubber, balloon fabric or the like and covered with these outer layers is optionally combined by vulcanization. z. procedure according to claim r, characterized in that the foamed in a known manner Rubber dispersions directly on the materials used as cover material, such as z. B. tissue, painted on and solidified and that then two such half-panels, optionally using a rubber milk mixture as a binder, with one another are connected and the plate is then vulcanized in a known manner.
DE1930597466D 1929-09-19 1930-09-17 Composite light rubber sheet Expired DE597466C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB597466X 1929-09-19

Publications (1)

Publication Number Publication Date
DE597466C true DE597466C (en) 1934-05-25

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DE1930597466D Expired DE597466C (en) 1929-09-19 1930-09-17 Composite light rubber sheet

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DE (1) DE597466C (en)

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