DE1194131B - Method and device for producing the frizzy corrugation of the edge strips of conveyor belts made of rubber or rubber-like materials - Google Patents

Method and device for producing the frizzy corrugation of the edge strips of conveyor belts made of rubber or rubber-like materials

Info

Publication number
DE1194131B
DE1194131B DEP13039A DEP0013039A DE1194131B DE 1194131 B DE1194131 B DE 1194131B DE P13039 A DEP13039 A DE P13039A DE P0013039 A DEP0013039 A DE P0013039A DE 1194131 B DE1194131 B DE 1194131B
Authority
DE
Germany
Prior art keywords
rubber
edge strips
corrugation
frizzy
conveyor belt
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.)
Pending
Application number
DEP13039A
Other languages
German (de)
Inventor
Georges Piemont
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of DE1194131B publication Critical patent/DE1194131B/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30—Belts or like endless load-carriers
    • B65G15/32—Belts or like endless load-carriers made of rubber or plastics
    • B65G15/42—Belts or like endless load-carriers made of rubber or plastics having ribs, ridges, or other surface projections
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • B29C66/4722—Fixing strips to surfaces other than edge faces
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B29D29/06—Conveyor belts
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/22—Corrugating
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7092—Conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Belt Conveyors (AREA)

Description

Verfahren und Vorrichtung zum Erzeugen der krausen artigen Wellung der Randleisten von Förderbändern aus Gummi oder gummiähnlichen Stoffen Man hat bereits vorgeschlagen, Förderbänder mit seitlichen Randleisten zu versehen, durch die das Förderband einen U-förmigen Querschnitt erhält. Damit die Randleisten den erforderlichen Krümmungen des Bandes folgen können, wenn das Band an den Enden der Förderstrecke über entsprechende Führung- und Wenderollen umläuft, hat man auch schon vorgeschlagen, die seitlichen Randleisten eines derartigen Förderbandes in Längsrichtung wellenförmig auszubilden. Die Randleisten können sich dann zwar an ihrer Oberkante im Bereich der Wendestellen des Bandes strecken, doch reißen sie trotz dieser Maßnahmen erfahrungsgemäß, besonders wegen des zunehmenden Abriebs, leicht ein, und dies führt häufig dazu, daß sich die Risse bei entsprechender Belastung des Bandes erweitern, bis schließlich das Band unbrauchbar wird.Method and apparatus for producing the frizzy-like corrugation the edge strips of conveyor belts made of rubber or rubber-like materials already proposed to provide conveyor belts with side edge strips by which the conveyor belt receives a U-shaped cross-section. So that the edge strips the required curvatures of the tape can follow when the tape is at the ends of the Conveyor line revolves over appropriate guide and turning rollers, one also has already proposed, the side edge strips of such a conveyor belt in To train longitudinally wavy. The edge strips can then admittedly stretch their upper edge in the area of the turning points of the tape, but they tear Despite these measures, experience shows, especially because of the increasing abrasion, easily, and this often leads to the fact that the cracks with appropriate load of the tape until the tape becomes unusable.

Der Erfindung liegt die Aufgabe zugrunde, die Randleisten im Bereich der engsten betriebsmäßig auftretenden Krümmung spannungslos zu halten. The invention is based on the object, the edge strips in the area to keep the tightest operationally occurring curvature free of tension.

Ausgehend von einem Verfahren zum Erzeugen der krausenartigen Wellung in rechtwinklig zur Grundfläche eines Förderbandes vorgesehenen Randleisten aus Gummi oder gummiähnlichen Stoffen durch krausenartiges Wellen der Randleisten vor der Vulkanisation besteht die Erfindung darin, daß die Randleisten derartig gewellt werden, daß sie auch bei der im Betrieb auftretenden engsten Krümmung noch eine flache Wellung besitzen und anschließend in dem auf diese Krümmung gebogenen Zustand vulkanisiert werden.Based on a method for producing the frill-like corrugation in edge strips provided at right angles to the base of a conveyor belt Rubber or rubber-like materials by frizz-like waves in the edge strips the vulcanization, the invention consists in the fact that the edge strips are corrugated in such a way that they still have a have flat corrugation and then in the state bent to this curvature to be vulcanized.

Hierdurch wird jegliches Spannen der gewellten Randleisten beim Krümmen des Förderbandes vermieden. Die Randleisten werden betriebsmäßig bei gestrecktem Band in Längsrichtung unter Druck gesetzt, so daß sich ihre Wellungen stärker ausprägen. This eliminates any tension on the corrugated edge strips when they are bent the conveyor belt avoided. The marginal ridges are operational when stretched Tape put under pressure in the longitudinal direction so that its corrugations are more pronounced.

Die Gefahr der Rißbildung durch eine Spannung der Randleisten ist hierdurch beseitigt. Auch bei weitgehendem Abrieb und allenfalls sogar Durchrieb der Wellungsfalten besteht noch die Möglichkeit, das Band zu verwenden, da die Wellungsfalten auch dann in der Krümmung noch zusammenhalten.There is a risk of cracking due to tension in the edge strips thereby eliminated. Even with extensive abrasion and possibly even through abrasion the corrugation folds, there is still the option to use the tape, as the corrugation folds even then still hold together in the curvature.

In besonders einfacher Weise wird das Verfahren nach der Erfindung bei Verwendung von am Förderband zu befestigenden Winkelleisten mit einer Vorrichtung durchgeführt, die im wesentlichen aus einer an sich bekannten Trommel mit Wendelrinne zur Aufnahme der Winkelleiste während ihrer Vulkanisation besteht. The method according to the invention is carried out in a particularly simple manner when using angle strips to be attached to the conveyor belt with a device carried out, which consists essentially of a known drum with a spiral groove to accommodate the angle bar during its vulcanization.

Die Zeichnung zeigt Beispiele für die Ausführung des Verfahrens nach der Erfindung und für ein danach hergestelltes Förderband, und zwar Fig. 1 das Wellen einer Winkelleiste aus Gummi vor dem Vulkanisieren, F i g. 2 die Gestalt der Winkelleiste beim Vulkanisieren, Fig.3 die fertig vulkanisierte Winkelleiste nach dem Anbringen an dem gestreckten Teil eines Förderbandes, Fig.4 schematisch die Herstellung eines Förderbandes mit einteilig angebrachten Randleisten in einzelnen Abschnitten, F i g. 5 eine mit wendelförmiger Rinne versehene Trommel zum Vulkanisieren von wellenförmigen Winkelleisten größerer Länge, F i g. 6 eine Teildarstellung von F i g. 5 in größerem Maßstab und F i g. 7 die Anbringung der Winkelleisten an einem Förderband. The drawing shows examples for the execution of the method according to of the invention and for a conveyor belt produced thereafter, namely Fig. 1 shows the waves an angle strip made of rubber before vulcanization, FIG. 2 the shape of the angle bar when vulcanizing, Fig. 3 the fully vulcanized angle strip after attachment on the stretched part of a conveyor belt, Figure 4 schematically the production of a Conveyor belt with one-piece edge strips in individual sections, F i g. 5 a drum provided with a helical groove for vulcanizing wave-shaped Angular strips of greater length, FIG. 6 shows a partial representation of FIG. 5 in larger Scale and fig. 7 the attachment of the angle bars to a conveyor belt.

F i g. 1 zeigt eine Profilleiste 1 aus unvulkanisiertem Gummi, die als Winkelleiste von rechtwinkligem Querschnitt von einer Walzenpresse oder Strangformmaschine geliefert wird. Der Schenkel 2 dieser Leiste wird wellenförmig gekräuselt, beispielsweise mittels Formstäben 3 und 4, mit denen der senkrechte Schenkel der Leiste abwechselnd nach entgegengesetzten Seiten durchgebogen wird. Das Band wird dann in bestimmte Längen geschnitten und gemäß F i g. 2 um den glatten Schenkel kreisförmig gebogen, so daß sich die Wellen des Schenkels 2 strecken. In dieser Lage, in der die gewellte Profilleiste auf einem geeigneten Träger festgespannt sein kann, wird der Gummi dann vulkanisiert. Der vulkanisierte Streifen behält seine Krümmung und seine gestreckten Wellen bei. Wird er dann mit dem ungewellten Schenkel geradlinig gebogen und an ein gestrecktes Förderband 4 gemäß F i g. 3 angeklebt, anvulkanisiert oder angenietet, so wird der gewellte Teil beim Strecken des glatten Schenkels unter Druck gesetzt, so daß sich die Wellungen wieder schärfer ausprägen. F i g. 1 shows a profile strip 1 made of unvulcanized rubber, which as an angle bar with a right-angled cross-section from a roller press or extrusion molding machine is delivered. The leg 2 of this bar is curled in a wave-like manner, for example by means of shaped rods 3 and 4, with which the vertical leg of the bar alternates is bent to opposite sides. The tape is then given in Cut lengths and according to F i g. 2 curved around the smooth leg, so that the waves of the leg 2 stretch. In this situation, in which the corrugated profile strip can be clamped on a suitable carrier, the rubber is then vulcanized. The vulcanized strip retains its curvature and its elongated waves. Then it becomes straight with the non-corrugated leg bent and attached to an elongated conveyor belt 4 according to FIG. 3 glued on, vulcanized on or riveted, the corrugated part is under when stretching the smooth leg Pressure set so that the corrugations are sharper again.

Bei dieser Ausführung des Förderbandes stehen seine Randleisten mit den gewellten Teilen im gesteckten Zustand nur unter inneren Druckspannungen und werden spannungslos, wenn das Förderband an seinen Wendestellen über die Führungstrommeln läuft. Die bisherigen Zugspannungen beim Krümmen des Bandes in den Randstreifen werden somit vermieden, so daß die Randleisten nicht mehr einreißen können. In this version of the conveyor belt, its edge strips are with it the corrugated parts in the mated state only under internal compressive stresses and are de-energized when the conveyor belt passes over the guide drums at its turning points runs. The previous tensile stresses when the belt was bent into the edge strips are thus avoided, so that the edge strips can no longer tear.

Gemäß F i g. 4 können die gewellten Randstreifen 2 an das Förderband 5 mit einer Form 6 auch abschnittweise unmittelbar angeformt werden, wobei schon dieses Anformen in gekrümmtem Zustand des Förderbandes vor sich geht, in dem das Band anschließend auch abschnittweise vulkanisiert wird. According to FIG. 4, the corrugated edge strips 2 can be attached to the conveyor belt 5 are also formed directly in sections with a mold 6, with already this molding in the curved state of the conveyor belt is going on in which the Tape is then also vulcanized in sections.

Um das Vulkanisieren der gewellten Randstreifen in gekrümmtem Zustand zu erleichtern, werden die Winkelleisten zweckmäßig gemäß F i g. 5 und 6 auf eine Blechtrommel 7 aufgewickelt, deren Gestell eine mittlere Tragstange 8 mit einer Öse 8' zum Aufhängen der Trommel aufweist. Der Trommelmantel ist mit einer wendelförmigen Rinne 9 versehen, in die sich die Winkelleiste beim Aufwickeln auf die Trommel mit ihrem gewellten Schenkel 2 einlegt, während sie sich mit ihrem glatten Schenkel am Trommelmantel abstützt. Die Trommel wird dann mit der daraufgewickelten Winkelleiste in einen Vulkanisierapparat gebracht. About the vulcanization of the corrugated edge strips in a curved state To facilitate, the angle strips are expediently shown in FIG. 5 and 6 on one Coiled sheet metal drum 7, the frame has a middle support rod 8 with a Has eyelet 8 'for hanging the drum. The drum jacket is with a helical one Channel 9 provided, in which the angle bar when winding on the drum with her corrugated thigh 2 inserts while she is with her smooth thigh supported on the drum shell. The drum is then wrapped with the angle bar placed in a vulcanizer.

Claims (2)

Patentansprüche: 1. Verfahren zum Erzeugen der krausenartigen Wellung in rechtwinklig zur Grundfläche eines Förderbandes vorgesehenen Randleisten aus Gummi oder gummiähnlichen Werkstoffen durch krausenartiges Wellen der Randleisten vor der Vulkanisation, dadurch gekennzeichnet, daß die Randleisten derartig gewellt werden, daß sie auch bei der im Betrieb auftretenden engsten Krümmung noch eine flache Wellung besitzen, und anschließend in dem auf diese Krümmung gebogenen Zustand vulkanisiert werden. Claims: 1. A method for producing the frizzy undulation in edge strips provided at right angles to the base of a conveyor belt Rubber or rubber-like materials due to the frizzy corrugation of the edge strips before vulcanization, characterized in that the edge strips are corrugated in this way that they still have a have flat corrugation, and then in the state bent to this curvature to be vulcanized. 2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 bei Verwendung von am Förderband zu befestigenden Winkelleisten, gekennzeichnet durch eine an sich bekannte Trommel mit Wendelrinne zur Aufnahme der Winkelleiste während ihrer Vulkanisation. 2. Apparatus for performing the method according to claim 1 at Use of angle strips to be attached to the conveyor belt, characterized by a drum known per se with a spiral groove for receiving the angle bar during their vulcanization. In Betracht gezogene Druckschriften: Deutsche Patentschriften Nr. 656 894, 665 307, 896 714; USA.-Patentschriften Nr. 2 522 359. Considered publications: German Patent Specifications No. 656 894, 665 307, 896 714; U.S. Patent No. 2,522,359.
DEP13039A 1953-11-20 1954-11-15 Method and device for producing the frizzy corrugation of the edge strips of conveyor belts made of rubber or rubber-like materials Pending DE1194131B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2831215X 1953-11-20
FR757868X 1953-11-20

Publications (1)

Publication Number Publication Date
DE1194131B true DE1194131B (en) 1965-06-03

Family

ID=26219232

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP13039A Pending DE1194131B (en) 1953-11-20 1954-11-15 Method and device for producing the frizzy corrugation of the edge strips of conveyor belts made of rubber or rubber-like materials

Country Status (3)

Country Link
BE (1) BE533228A (en)
DE (1) DE1194131B (en)
GB (1) GB757868A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE665307C (en) * 1935-05-12 1938-09-22 Continental Gummi Werke Akt Ge U-shaped, flexible conveyor belt in cross section
DE656894C (en) * 1932-10-27 1939-05-10 Optimat Keilriemen Ges M B H Device for vulcanizing V-belts
US2522359A (en) * 1948-10-27 1950-09-12 Goodrich Co B F Apparatus for vulcanizing endless articles
DE896714C (en) * 1941-03-09 1953-11-16 Grete Meyer Device for vulcanizing flat rubber belts with or without inserts

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE656894C (en) * 1932-10-27 1939-05-10 Optimat Keilriemen Ges M B H Device for vulcanizing V-belts
DE665307C (en) * 1935-05-12 1938-09-22 Continental Gummi Werke Akt Ge U-shaped, flexible conveyor belt in cross section
DE896714C (en) * 1941-03-09 1953-11-16 Grete Meyer Device for vulcanizing flat rubber belts with or without inserts
US2522359A (en) * 1948-10-27 1950-09-12 Goodrich Co B F Apparatus for vulcanizing endless articles

Also Published As

Publication number Publication date
BE533228A (en) 1900-01-01
GB757868A (en) 1956-09-26

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