EP0332737A2 - Dispositif de fabrication de tuiles en béton à plusieurs couches - Google Patents

Dispositif de fabrication de tuiles en béton à plusieurs couches Download PDF

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Publication number
EP0332737A2
EP0332737A2 EP88116569A EP88116569A EP0332737A2 EP 0332737 A2 EP0332737 A2 EP 0332737A2 EP 88116569 A EP88116569 A EP 88116569A EP 88116569 A EP88116569 A EP 88116569A EP 0332737 A2 EP0332737 A2 EP 0332737A2
Authority
EP
European Patent Office
Prior art keywords
layer
concrete
base layer
gap
coating
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.)
Granted
Application number
EP88116569A
Other languages
German (de)
English (en)
Other versions
EP0332737B1 (fr
EP0332737A3 (en
Inventor
Manfred Weisweiler
Günter Jöst
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.)
Braas GmbH
Original Assignee
Braas GmbH
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 Braas GmbH filed Critical Braas GmbH
Priority to AT88116569T priority Critical patent/ATE85769T1/de
Publication of EP0332737A2 publication Critical patent/EP0332737A2/fr
Publication of EP0332737A3 publication Critical patent/EP0332737A3/de
Application granted granted Critical
Publication of EP0332737B1 publication Critical patent/EP0332737B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
    • B28B1/16—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted for producing layered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/04—Apparatus or processes for treating or working the shaped or preshaped articles for coating or applying engobing layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/12—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material
    • B28B3/123—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material on material in moulds or on moulding surfaces moving continuously underneath or between the rollers, e.g. on an endless belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
    • B28B5/028—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of definite length, e.g. succession of moving pallets, and being continuously fed

Definitions

  • the invention relates to a device for producing multilayer concrete roof tiles in the extrusion process. Furthermore, the invention relates to the concrete roof tiles available with the new device, which have, for example, a coating with improved weather resistance, color fastness and / or service life on a base body made of conventional concrete.
  • the new device is suitable for the production of slab-like concrete roof tiles as well as for the production of profiled concrete roof tiles.
  • the invention relates to a device for the production of concrete roof tiles in the extrusion process, with a coating system which can be supplied with fresh concrete for applying a continuous fresh concrete layer to a continuous strand of displaceable, forcibly driven underforms, furthermore with a compacting roller and a smoothing device adjoining it in the production direction for compacting and if necessary, profiling the base layer made of fresh concrete underneath on the lower molds.
  • a device for the strand production of multi-layer concrete moldings, in particular roof tiles, is also known from German published patent application 18 15 973.
  • the finished roof tiles consist of a basic concrete layer and at least one further concrete layer to form the visible surface.
  • the exposed concrete can differ from the basic concrete with regard to the content of color pigments and other additives as well as the grain structure and the like.
  • the known device includes a filling funnel which is divided by partitions into successively arranged chambers for the different types of concrete.
  • a spiked roller and a form roller are assigned to each chamber.
  • a compression die connects to the last form roller in the production direction, which compresses all sub-layers together. In this case, a spiked roller and a form roller are provided for each concrete layer.
  • the mechanical effort is great and the production of uniform partial layers leaves something to be desired.
  • the object of the present invention is to provide a device for producing multi-layer concrete roof tiles, which is simple in construction, can be easily integrated into existing systems and with which excellent adhesion between the sub-layers and exact adherence to the layer thickness for each individual sub-layer is achieved .
  • ge indicates that in the production direction behind the smoother for the base layer and separated from it by a gap running transversely to the production direction, at least one further smoother is provided for a further layer to be applied to the base layer, in particular cover layer, the contact surface of which is equal to the layer thickness of the further layer is arranged offset upwards relative to the contact surface of the smoothing device for the base layer; and the material for the further layer can be fed under pressure through the gap.
  • the device according to the invention enables a further layer to be compressed and profiled independently of the base layer.
  • the layer thickness of each partial layer can be set differently by arranging the smoothers accordingly.
  • the additional smoothers can also be easily integrated into existing production plants for the production of concrete roof tiles using the extrusion process, such as e.g. are known from DE-PS 22 52 047 or DE-OS 35 22 846.
  • Concrete roof tiles can also be produced on a system modified in this way, the base layer of which consists of simple, uncolored concrete of sufficient strength and which have a top layer of high-quality, colored concrete, which ensures weather resistance over the long period usually desired today.
  • the smoothers for the base layer and for the cover layer are held by a bridge spanning the conveying path of the lower molds and at least one channel is provided in the bridge, the outlet of which opens into the gap between the sheets and the entrance to one the material for the pump promoting the top layer is connected.
  • a screw pump is well suited as a pump, which guarantees the forced conveyance of paste-like masses, such as fresh concrete, under high mechanical pressure and which also enables precise metering of the supplied top layer material.
  • the straightener can be fixed and aligned independently of one another on the bridge by means of fastening means and adjusting means, so that the distance required for the respective layer thickness and the inclination of each smoothing device to the top of the lower molds can be precisely adjusted in a simple manner.
  • Another feature of the invention relates to the multi-layer concrete roof tiles obtainable with the device according to the invention, the base layer of which has been compacted, smoothed and optionally profiled by a smoother and the further layer (s), in particular top layer, by an additional smoother.
  • the base layer can consist of natural-colored concrete of medium quality and sufficient strength; and the top layer consists of a higher-quality concrete containing color pigments.
  • the concrete of the top layer can contain particularly fine-grained aggregates and selected dispersants.
  • the content of expensive additives such as color pigments, dispersants and particularly fine-grained additives, is limited to the top layer, the volume of which is significantly less than that of the base layer.
  • the thickness of the base layer can be 7 to 11 mm, in particular 9 mm, and the thickness of the cover layer can be 1 to 3 mm, in particular 2 mm.
  • a conveyor 10 has an endless drive chain 11 which runs around a drive sprocket 12 and a deflection sprocket 13. Above the drive chain 11, sub-molds 14 arranged one behind the other lie in an uninterrupted strand on guides and are pushed by not shown drivers, which are fastened to the drive chain, through the coating system 20, past the smoothing arrangement 30 and further through the cutting and dressing station 50 .
  • a feed conveyor 15 delivers empty sub-molds, and a discharge conveyor 16 transports the roof tile located on the sub-molds 14 moldings 19 further.
  • a fresh concrete container 21 of the coating system 20 is loaded with fresh concrete 23 from a mixer (not shown).
  • the lower molds 14 pass under the outlet 22 of the fresh concrete container 21, and a spiked roller 24 evenly coats the lower molds 14 with a fresh concrete base layer 17.
  • a compacting roller 25 adapted to the profile of the concrete roof tiles to be produced compresses and profiles the applied fresh concrete base layer 17.
  • the smoothing arrangement includes - as can be seen in particular from FIGS. 2 and 3 - a bridge 31 spanning the underform strand, on which a smoothing device 35 for the base layer 17th and a smoother 45 is arranged for the cover layer 18.
  • the smoother 35 for the base layer is inclined at a certain angle of attack with respect to the plane of travel of the lower molds 14 and, with its end face, which is formed to a pointed edge and faces the compressor roller 25, connects directly tangentially to its underside. With its contact surface 36, the smoother 35 presses, smoothes and profiles the fresh concrete base layer 17 located on the subforms 14 transported past.
  • the straightener 45 for the cover layer is separated from the straightener 35 for the base layer by a narrow gap 40 running transversely to the production direction according to arrow A.
  • the smoother 45 for the cover layer is also inclined at a certain angle of attack with respect to the plane of travel of the lower molds 14.
  • the pressure surface 46 of the smoothing device 45 is arranged higher by the layer thickness b of the covering layer 18 than the pressing surface 36 of the smoothing device 35.
  • the material 44 for the covering layer 18, also a concrete-like mass is used by a storage container 43 a pump 42, preferably designed as a screw pump, and by a pump in the bridge 31 provided channel 32 fed into the gap 40.
  • a laminate of ready-compacted and profiled fresh concrete consisting of the base layer 17 and the cover layer 18 leaves the shaping gap formed between the rear edge 46a of the smoothing device 45 for the cover layer and the top of the lower molds 14.
  • the laminate which is still in the form of an endless strand, is then conveyed further on the lower molds 14 to a cutting and dressing station 50 (cf. FIG. 1), where the endless strand is cut into individual roof tile moldings 19 by the cutting knife 51.
  • a dressing tool 52 By means of a dressing tool 52, the foot-side edge of the roof tile moldings can then be trimmed, as is detailed in DE-PS 22 52 047 or DE-OS 35 22 846.
  • the Dachsteinformlinge 19 then go into hardening chambers, not shown, in which they harden under controlled temperature and humidity conditions.
  • the concrete roof tiles are then separated from the lower molds 14 in a formwork removal station and then removed, while the lower molds are returned to production.
  • the smoothers are attached to the bridge 31 spanning the machine bed and the conveying path of the lower molds 14.
  • the straightener 35 for the base layer 17 is connected to the bridge 31 via fastening means 37, for which two screws are provided.
  • the distance and the inclination of the smoothing device 35 with respect to the upper side of the lower molds 14 can be adjusted via adjusting means 38, for which four screws are provided.
  • Corresponding fastening means 47 and adjusting means 48 are used for fastening and aligning the smoothing device 45 for the cover layer 18.
  • the smoothing devices are arranged in such a way that between the smoothing device 35 and the smoothing device 45 there remains a narrow gap 40 running transversely to the production direction and the smoothing device 45 is independent of this Smoother 35 can be aligned.
  • the pressure surfaces 36 and 46 of the smoother can be formed of a hard metal pad, which is connected via an intermediate layer of a metal / plastic mixture to a base made of steel, as is described in detail in EP-PS 0 035 010.
  • the base can also be attached to the bridge 31 via an additional pressure plate.
  • the gap 40 is sealed in its lateral edge areas with an elastic plastic profile 41, in particular made of polyurethane, in order to prevent an undesired escape of material 44 for the cover layer 18 here.
  • This material is conveyed under the pressure of the pump 42 through the channel 32, the outlet 34 of which opens into the gap 40 and the inlet 33 is connected to the pump 42.
  • the material for the cover layer is evenly distributed in the gap 40, so that a smooth cover layer 18 is also produced on the fresh concrete base layer 17 with the aid of the smoothing device 45.
  • the length of the gap 40 extends over the entire width of the lower molds 14, so that a full-surface coating of the top of the roof tile is obtained, which also includes the fold area.
  • the lower molds 14 and the smoothers 35, 45 have a shape for producing profiled concrete roof tiles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Medicinal Preparation (AREA)
  • Physical Vapour Deposition (AREA)
  • Disintegrating Or Milling (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Panels For Use In Building Construction (AREA)
  • Laminated Bodies (AREA)
EP88116569A 1988-03-18 1988-10-06 Dispositif de fabrication de tuiles en béton à plusieurs couches Expired - Lifetime EP0332737B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88116569T ATE85769T1 (de) 1988-03-18 1988-10-06 Vorrichtung zur herstellung mehrschichtiger betondachsteine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3809162 1988-03-18
DE3809162A DE3809162A1 (de) 1988-03-18 1988-03-18 Vorrichtung zur herstellung mehrschichtiger betondachsteine

Publications (3)

Publication Number Publication Date
EP0332737A2 true EP0332737A2 (fr) 1989-09-20
EP0332737A3 EP0332737A3 (en) 1990-07-11
EP0332737B1 EP0332737B1 (fr) 1993-02-17

Family

ID=6350122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116569A Expired - Lifetime EP0332737B1 (fr) 1988-03-18 1988-10-06 Dispositif de fabrication de tuiles en béton à plusieurs couches

Country Status (10)

Country Link
US (1) US4986744A (fr)
EP (1) EP0332737B1 (fr)
JP (1) JPH01301205A (fr)
AT (1) ATE85769T1 (fr)
AU (1) AU616433B2 (fr)
DE (2) DE3809162A1 (fr)
DK (1) DK171733B1 (fr)
ES (1) ES2038267T3 (fr)
HU (1) HU202435B (fr)
NO (1) NO173174C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932573A1 (de) * 1989-09-29 1991-04-11 Nelskamp Dachziegelwerke Gmbh Betondachstein mit einer aufextrudierten oberflaechenbeschichtung sowie verfahren und vorrichtung zu seiner herstellung
US5595698A (en) * 1993-07-29 1997-01-21 Monier Roof Tile, Inc. Method of making multi-color concrete tiles

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6311448B1 (en) 1998-01-21 2001-11-06 Rohm And Haas Company Precast concrete plates
GB2344300B (en) 1998-12-05 2001-01-24 Rohm & Haas A method of coating an uncured mineral substrate
US6306465B1 (en) 1999-08-03 2001-10-23 Rohm And Haas Company Method of coating an uncured mineral substrate
GB0217543D0 (en) * 2002-07-30 2002-09-11 Buildmate As Method for surface treatment of clay ceramic or cementious articles
HUE029971T2 (en) 2006-02-23 2017-04-28 Monier Roofing Gmbh New roof tiles for increased surface durability and process
US7922950B2 (en) * 2006-03-14 2011-04-12 3M Innovative Properties Company Monolithic building element with photocatalytic material
EP2096183B1 (fr) * 2006-10-23 2013-06-19 Mitsubishi Materials Corporation Procédé et appareil de production d'un corps poreux
DE102007048694A1 (de) * 2007-10-11 2009-04-23 Hess Maschinenfabrik Gmbh & Co. Kg Verfahren und Vorrichtung zum Herstellen von Betonsteinen
DE102009021123B4 (de) * 2009-05-13 2015-01-15 Monier Technical Centre Gmbh Verfahren zum Herstellen eines Betonkörpers sowie Anlage hierfür
US9676118B2 (en) * 2013-09-16 2017-06-13 National Gypsum Properties, Llc Formation of cementitious board with lightweight aggregate
MX2022006152A (es) 2019-11-26 2022-08-08 Bmic Llc Paneles de techumbre con características de evacuación de agua.
CA3165523A1 (fr) * 2020-01-17 2021-07-22 Bmic Llc Panneaux de toiture a deversement d'eau integree
CA3160250A1 (fr) 2021-05-25 2022-11-25 Bmic Llc Systeme de couverture en panneaux

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE295486C (fr) *
DE44070C (de) * F. NAUMANN in Plottendorf b. Treben, Sachsen-Altenburg Prefswerk mit einem Walzenpaare zur Herstellung von Verblendstetnen
US1750113A (en) * 1928-03-06 1930-03-11 George C Martin Method for forming slabs
US2752656A (en) * 1955-02-07 1956-07-03 W E Dunn Mfg Company Tile apparatus
US2965949A (en) * 1957-10-07 1960-12-27 Gus W Lang Machines for forming and coating roofing tiles
US3138843A (en) * 1962-03-29 1964-06-30 Frank A Gory Coating attachment for tile machine
US3146508A (en) * 1959-11-03 1964-09-01 Henry A Berliner Apparatus for extruding reinforced members
GB2200930A (en) * 1987-02-13 1988-08-17 Redland Roof Tiles Ltd Roof tile with mock-joint

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US3193903A (en) * 1962-05-11 1965-07-13 Nordon Inc Tile casting installation
GB1048829A (en) * 1963-12-10 1966-11-23 Ilford Ltd High speed coating apparatus
BE790282A (fr) * 1971-10-25 1973-02-15 Redland Tiles Ltd Appareil perfectionne pour la fabrication de tuiles
US3884611A (en) * 1973-10-24 1975-05-20 Leesona Corp Extrusion die
US3958532A (en) * 1974-07-22 1976-05-25 Polaroid Corporation Coating apparatus
US4272230A (en) * 1975-09-05 1981-06-09 Solai Vignola Di Faviani Orlando Ec Societa Slip form for building components
DE2614596C3 (de) * 1976-04-05 1980-03-13 Vereinigte Glaswerke Gmbh, 5100 Aachen Abstreichgießkopf zum Aufbringen gießfähiger Kunststoffschichten auf plane Unterlagen
US4143187A (en) * 1977-12-01 1979-03-06 Du Pont Of Canada Limited Process for coating sheet substrates with thermoplastic polymer
SE427815B (sv) * 1980-02-29 1983-05-09 Abece Ab Maskin for formning av betongtakpannor
JPS58205561A (ja) * 1982-05-25 1983-11-30 Fuji Photo Film Co Ltd 塗布方法及び装置
US4853995A (en) * 1982-09-15 1989-08-08 Sears Manufacturing Company Molded cushion article
US4520049A (en) * 1983-01-24 1985-05-28 Kao Corporation Method and apparatus for coating
FR2546812B1 (fr) * 1983-05-30 1986-04-18 Saint Gobain Vitrage
US4526528A (en) * 1984-06-28 1985-07-02 The Goodyear Tire & Rubber Company Apparatus for forming a co-extrusion from extruded strips
GB2164288B (en) * 1984-09-12 1988-06-02 Redland Roof Tiles Ltd Method and apparatus for manufacturing roof tiles and tiles made thereby
AU4486285A (en) * 1984-11-20 1986-05-29 Uralita S.A. Layered concrete or mortar tile

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE295486C (fr) *
DE44070C (de) * F. NAUMANN in Plottendorf b. Treben, Sachsen-Altenburg Prefswerk mit einem Walzenpaare zur Herstellung von Verblendstetnen
US1750113A (en) * 1928-03-06 1930-03-11 George C Martin Method for forming slabs
US2752656A (en) * 1955-02-07 1956-07-03 W E Dunn Mfg Company Tile apparatus
US2965949A (en) * 1957-10-07 1960-12-27 Gus W Lang Machines for forming and coating roofing tiles
US3146508A (en) * 1959-11-03 1964-09-01 Henry A Berliner Apparatus for extruding reinforced members
US3138843A (en) * 1962-03-29 1964-06-30 Frank A Gory Coating attachment for tile machine
GB2200930A (en) * 1987-02-13 1988-08-17 Redland Roof Tiles Ltd Roof tile with mock-joint

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932573A1 (de) * 1989-09-29 1991-04-11 Nelskamp Dachziegelwerke Gmbh Betondachstein mit einer aufextrudierten oberflaechenbeschichtung sowie verfahren und vorrichtung zu seiner herstellung
US5595698A (en) * 1993-07-29 1997-01-21 Monier Roof Tile, Inc. Method of making multi-color concrete tiles

Also Published As

Publication number Publication date
DK171733B1 (da) 1997-04-21
DK555388A (da) 1989-09-19
EP0332737B1 (fr) 1993-02-17
NO884441L (no) 1989-09-19
DE3878555D1 (de) 1993-03-25
DK555388D0 (da) 1988-10-04
JPH01301205A (ja) 1989-12-05
NO173174C (no) 1993-11-10
US4986744A (en) 1991-01-22
NO173174B (no) 1993-08-02
NO884441D0 (no) 1988-10-06
EP0332737A3 (en) 1990-07-11
ES2038267T3 (es) 1993-07-16
AU2355388A (en) 1989-09-21
HUT52192A (en) 1990-06-28
DE3809162A1 (de) 1989-09-28
ATE85769T1 (de) 1993-03-15
AU616433B2 (en) 1991-10-31
HU202435B (en) 1991-03-28

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