SK52596A3 - Device for cutting solid, still not hardened porous concrete block - Google Patents
Device for cutting solid, still not hardened porous concrete block Download PDFInfo
- Publication number
- SK52596A3 SK52596A3 SK52596A SK52596A SK52596A3 SK 52596 A3 SK52596 A3 SK 52596A3 SK 52596 A SK52596 A SK 52596A SK 52596 A SK52596 A SK 52596A SK 52596 A3 SK52596 A3 SK 52596A3
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- Prior art keywords
- cutting
- grates
- grate
- width
- gaps
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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
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/14—Apparatus or processes for treating or working the shaped or preshaped articles for dividing shaped articles by cutting
- B28B11/145—Apparatus or processes for treating or working the shaped or preshaped articles for dividing shaped articles by cutting for dividing block-shaped bodies of expanded materials, e.g. cellular concrete
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/547—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member
- B26D1/553—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member with a plurality of wire-like cutting members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D11/00—Combinations of several similar cutting apparatus
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
Description
Zariadenie Jť rezaniÄ- tuhého, ešte neztvrdnutého pórobetónového blokuApparatus J1 of a rigid, not yet hardened, aerated concrete block
Oblasť technikyTechnical field
Vynález sa týka zariadenia k rezaniu tuhého, ešte neztvrdnutého pórobetónového bloku, ležiaceho s výhodou svojou šírkou na rezacom lôžku, na telesá v tvare kvádru ako sú napr. tehly, dosky alebo hranoly, najmä podľa normovaných formátov (podľa DIN 4165, DIN 4166), ako popisuje predvýznaková časť nároku 1.The invention relates to a device for cutting a rigid, yet unhardened, aerated concrete block, which preferably lies on a cutting bed, by its width, onto block-shaped bodies such as e.g. bricks, slabs or prisms, in particular according to standardized formats (according to DIN 4165, DIN 4166), as described in the preamble of claim 1.
Doterajší stav techniky stanovenom odstupe rozpernými kolíkmi, paralelnom odstupeBACKGROUND OF THE INVENTION Specified spacing by spacing pins, parallel spacing
Takéto zariadenie s pojazdným rezacím lôžkom a nehybnou rámovou pílou je známe napr. z EP 0 280 350 Al alebo SE-PSSuch a device with a traveling cutting bed and a stationary frame saw is known e.g. from EP 0 280 350 A1 or SE-PS
211798. Pórobetónový blok sa teda uloží do rezacieho zariadenia a leží pred rezom, v priebehu rezu a po vykonanom reze na roštniciach, ktoré sú usporiadané horizontálne v paralelných odstupoch. Roštnice ležia pred rezom aj po tomto volne na priečnych nosníkoch pojazdného nosného rámu a sú udržované v priečnymi nosníkmi s kolmo usporiadanými Pri rezu sa roštnice presunú na otočný, v usporiadaný priečny hriadeľ s kruhovými žliabkami alebo kotúčmi, v ktorých resp. medzi ktorými sú uložené roštnice v rovnakom odstupe bez možnosti posuvu. Na otočných hriadeľoch sa potom na roštnice uloží pórobetónový blok a nehybným rezacím rámom sa pomocou rezacích drôtov usporiadaných v stanovených odstupoch vo vertikálnych rovinách prereže do určených formátov, pričom rezacie drôty prejdú medzerami vo forme tzv. rezných štrbín medzi roštnicami. Po reze prejdú roštnice za rezacím rámom na priečne nosníky s rozpernými kolíkmi ďalšieho nosného rámu, s ktorým vyjdú z rezacieho zariadenia.Thus, the aerated concrete block is placed in the cutting device and lies in front of the cut, during the cut and after the cut has been carried out on the grates, which are arranged horizontally at parallel intervals. The grates lie loosely on the crossbeams of the traveling support frame both before and after the cutting and are kept in crossbars with perpendicularly arranged. During the cutting, the grates are moved to a rotatable, arranged transverse shaft with circular grooves or discs. between which the grates are placed at the same distance without the possibility of displacement. A porous concrete block is then placed on the rotary shafts and cut into defined formats by means of cutting wires arranged at specified intervals in vertical planes on fixed grids, whereby the cutting wires pass through gaps in the form of so-called. slits between the grates. After cutting, the grates pass behind the cutting frame onto the crossbeams with the spacing pins of another support frame with which they come out of the cutting device.
Zariadenia s nehybným rezacím lôžkom a pojazdnou rámovou pílou, v ktorých sú roštnice usporiadané pomocou upevňovacích prvkov v odstupe tak, že vytvárajú medzery a ležia teda voľne na priečnych nosníkoch, pracujú takým spôsobom, že každý priečny nosník pri priblížení spodnej podpery rámu píly automaticky klesne, takže podperu je možné odsunúť, zatiaľ kým roštnice zasa preberá druhý priečny nosník. Po operácii sa priečny nosník opäť automaticky nadvihne a podchytí tak znovu roštnice.Fixed cutting bed devices with a movable frame saw, in which the grates are spaced apart by means of fasteners so as to form gaps and thus lie freely on the crossbeams, work in such a way that each crossbeam automatically drops when the lower frame frame is approached, so that the support can be displaced while the grate takes over the second cross beam. After the operation, the crossbeam is automatically lifted again and the grate is again caught.
Objavili sa snahy vytvoriť rezacie zariadenie s nehybným rezacím lôžkom a mechanicky zo strán nastaviteľnými lamelami, tak, že by sa mohol zárez medzi dvomi lamelami zväčšiť tak, že by bolo možné vytvárať rôzne formáty telies (DE-PS 28 115, DE 34 34 505 Cl). Konštrukčné usporiadanie tohto prestavania je však veľmi komplikované, nákladné a môže byť v dôsledku toho aj značne poruchové. Z tohto dôvodu sa toto konštrukčné usporiadanie v praxi doposiaľ nepresadilo. Naviac by bolo v tomto prípade nutné používať rôzne typy roštov.Efforts have been made to provide a cutting device with a stationary cutting bed and mechanically adjustable slats so that the slit between the two slats can be enlarged so that different body formats can be produced (DE-PS 28 115, DE 34 34 505 Cl ). The design of this adjustment is, however, very complicated, costly and, as a result, can be considerably defective. For this reason, this design arrangement has not yet been implemented in practice. In addition, different types of grates would have to be used in this case.
Podstata vynálezuSUMMARY OF THE INVENTION
Cieľom vynálezu je vytvoriť rezacie zariadenie konštrukčne jednoduché za pomoci jednoduchých prostriedkov, ktoré by mohlo rezať najmenej dva rozdielne, najmä normované formáty telies.It is an object of the invention to provide a cutting device that is structurally simple by means of simple means which could cut at least two different, in particular standardized, body formats.
Táto úloha bola vyriešená prostriedkami popísanými v nároku 1. Ďalšie výhodné prevedenia, ktoré patria do rozsahu vynálezu sú definované v závislých nárokoch.This object has been achieved by the means described in claim 1. Further advantageous embodiments within the scope of the invention are defined in the dependent claims.
Výkresydrawings
Vynález bude možné bližšie objasniť pomocou týchto výkresov :The invention will be explained in more detail by means of the following drawings:
obr. 1 perspektívne a schématické zobrazenie zvyčajného rezacieho zariadenia, obr. 2 výsek zariadenia z obr. 1, obr. 3 perspektívne a schématické znázornenie transportu roštnice stanicou pre pozdĺžny rez, obr. 4 a-e schématické znázornenie príkladov rozdelenia drôtov pre rez rôznych formátov pri rovnakom nastavení roštníc v rezacom lôžku.Fig. 1 shows a perspective and schematic representation of a conventional cutting device, FIG. 2 shows a section of the device of FIG. 1, FIG. 3 is a perspective and schematic representation of the transport of the grate through the longitudinal section station; FIG. 4 a-e is a schematic representation of examples of wire splitting for cutting different formats with the same grating settings in the cutting bed.
Popisdescription
Zvyčajné rezacie zariadenie s nehybnou pozdĺžnou rámovou pílou, v ktorom sa predmet vynálezu používa, je vybavené stanicou pre príjem 1, stanicou pre priečny rez 2 a stanicou pre pozdĺžny rez 3. Pórobetónový blok 4, ktorý má byt rezaný, sa uloží na roštnice 6 resp. roštové nosníky usporiadané v stanovenom odstupe paralelne s pozdĺžnym smerom rezu 5a na týchto roštniciach 6 sa transportuje stanicami 1, 2 a 3.A conventional stationary longitudinal frame saw cutting machine in which the present invention is used is provided with a reception station 1, a cross-section station 2 and a longitudinal section station 3. The aerated concrete block 4 to be cut is placed on the grates 6 and 6 respectively. . The grate beams arranged at a set distance parallel to the longitudinal direction of the cut 5a on these grate bars 6 are transported by stations 1, 2 and 3.
Roštnice 6 ležia voľne na priečnych nosníkoch 7, kolmo usporiadaných k roštniciam 6 v ráme roštu 8, ktorý pozostáva v podstate z dvoch rámových nosníkov 9 usporiadaných paralelne k roštniciam 6a z niekoľkých na týchto upevnených priečnych nosníkov 7, medzi ktorými vzniká medzera 10 (obr. 2).The grate 6 lies loosely on the crossbeams 7, perpendicular to the grate 6 in the frame of the grate 8, which consists essentially of two frame beams 9 arranged parallel to the grate 6a and a plurality of crossbeams 7 fixed thereto. 2).
Na priečnych nosníkoch sú vertikálne upevnené ako prvky zabezpečujúce odstup rozperné určitým odstupom, pričom každý roštnice, takže sa roštnica 6 ležat na priečnom nosníku 7.They are vertically mounted on the crossbeams as spacing elements spaced apart by a certain distance, with each grate so that the grate 6 lies on the crossbeam 7.
prvky 11 resp. kolíky vždy s odstup zodpovedá zvyčajne šírke do tohto miesta zasunie a môže Kolíky 11 umožňujú, aby medzi roštnicami bola zachovaná najmenej hrúbke kolíku 11.elements 11 resp. the pins always with a spacing corresponding usually to the width of the insertion point and can the pins 11 allow at least the thickness of the pin 11 to be maintained between the grates.
rezná štrbina 12, ktorá zodpovedáa cutting slot 12 corresponding to
Rámové nosníky 9 sú uložené na otočných valčekoch 13 alebo podobnom prostriedku, takže roštový rám je možné posunúť do stanice pre priečny rez 2 na valčekoch 13.The frame beams 9 are supported on rotatable rollers 13 or the like so that the grate frame can be moved to the cross-section station 2 on the rollers 13.
V stanici pre priečny rez sa pórobetónový blok 4 rozreže zvyčajným spôsobom pomocou rezacieho rámu 14 naprieč. Potom roštnice spolu s naprieč prerezaným pórobetónovým blokom prevezmú otočné nosné hriadele 15, ktoré sú usporiadané paralelne k priečnym nosníkom 7 a majú ako prvky zabezpečujúci odstup namiesto rozperných kolíkov usporiadané rozperné kotúče 16 alebo zodpovedajúce kruhové drážky na tých miestach, ktoré liacujú v pozdĺžnom smere rezu 5 s rozpernými kolíkmi 11. Nosné hriadele 15 sú či jednotlivo alebo ak sú usporiadané v ráme spolu s rámom vertikálne v smere šípky 17 posúvateľné nahor a dole. Nosné hriadele 15 prejdú pre prevzatí roštníc 6 medzerami 10 medzi priečnymi nosníkmi 7 a zdvihnú roštnice 6 z priečnych nosníkov 7. Nato sa pórobetónový blok 4 ležiaci v pozdĺžnom smere rezu na roštniciach 6 transportuje pozdĺžnou rámovou pílou 18, pričom rezacie drôty 19 pozdĺžnej rámovej píly 18 prenikajú vždy reznou štrbinou 12 celým pórobetónovým blokom 4. Po tejto operácii nosné hriadele 15 znova klesnú a roštnice prevezme ďalší nosný rám 8.In the cross-section station, the aerated concrete block 4 is cut in the usual manner by means of a cutting frame 14 crosswise. Then the grates together with the cross-sectioned aerated concrete block assume the rotatable support shafts 15, which are arranged parallel to the crossbeams 7 and have spacers 16 or the corresponding circular grooves in the longitudinal direction of the cross-section in place of the spacer pins. The support shafts 15 are displaceable up and down either individually or when arranged in the frame together with the frame vertically in the direction of the arrow 17. The support shafts 15 pass through the gaps 10 between the crossbeams 7 to take up the grate 6 and lift the grate 6 from the crossbeam 7. The aerated concrete block 4 lying in the longitudinal cutting direction on the grate 6 is then transported by the longitudinal frame saw 18. they always penetrate the entire aerated concrete block 4 through the cutting slot 12. After this operation, the support shafts 15 fall again and the grids take over another support frame 8.
Vynález je však možné aplikovať v zvyčajných rezacích zariadeniach, v ktorých rezný rám rámovej píly 18 prechádza v pozdĺžnom smere rezu 5 a rezacie lôžko je nehybné. Pritom sú priečne nosníky usporiadané zvyčajným spôsobom tak, že je možné ich zdvihnúť alebo znížiť. Keď sa rezný rám dostane do blízkosti priečneho nosníka 7, tento nosník klesne, takže spodná podpera rezného rámu môže volne prejsť cez priečny nosník. Keď podpera prejde cez priečny nosník, vráti sa tento nosník do svojej východzej pozície.However, the invention can be applied in conventional cutting devices in which the cutting frame of the frame saw 18 extends in the longitudinal direction of the cut 5 and the cutting bed is stationary. The crossbeams are arranged in such a way that they can be raised or lowered. When the cutting frame comes close to the crossbeam 7, the beam is lowered so that the lower support of the cutting frame can pass freely over the crossbeam. When the support crosses the cross beam, the beam returns to its starting position.
Podľa vynálezu sú v rezacom lôžku usporiadané rezné štrbiny 12 medzi roštnicami 6 priečne k pozdĺžnemu smeru rezu 5 tak, že je možné rezať rozdielne formáty, najmä formáty podľa DIN. Pritom sa používa rámová píla 18, v ktorej sú zvyčajným spôsobom v meniteľných odstupoch usporiadané rezacie drôty 19, ktoré sú umiestnené s možnosťou presadenia priečne k smeru rezu.According to the invention, cutting slits 12 are arranged in the cutting bed between the grate 6 transversely to the longitudinal direction of the cut 5 so that different formats, in particular DIN formats, can be cut. In this case, a frame saw 18 is used, in which cutting wires 19 are arranged at varying intervals in a customary manner and are arranged transversely to the cutting direction.
V obr. 4 a 5, vždy a až e sú znázornené príklady rozdelenia rezných štrbín 12, 12a a rozmiestnenie rezacích drôtov 19.In FIG. 4 and 5, in each case a to e, examples of the distribution of the cutting slits 12, 12a and the distribution of the cutting wires 19 are shown.
Vedľa roštnice 6 sa tiež používajú širšie roštnice 6a. Šírka roštnice 6 je 10 mm a šírka roštnice 6a 20 mm. Hrúbka rozperných kolíkov 11 je 4 mm, pričom roštnice 6 a 6a sú vždy zasunuté medzi dva rozperné kolíky 11. Šírka reznej štrbiny 12 zodpovedá hrúbke rozperného kolíku 11 a je 14 mm.In addition to the grate 6, wider grates 6a are also used. The grate width 6 is 10 mm and the grate width 6 and 20 mm. The thickness of the spacing pins 11 is 4 mm, with the grids 6 and 6a being each inserted between the two spacing pins 11. The width of the cutting slot 12 corresponds to the thickness of the spacing pin 11 and is 14 mm.
Spolu so zobrazenou schémou rozdelenia rozperných kolíkov 11 pri kombinácii s roštnicami 6, 6a a reznými štrbinami 12, 12a je tiež možné zvoliť rozdelenie rezacích drôtov 19, ako je znázornené na obr. 4 a 5, a až e.Along with the diagram of the distribution of the spacing pins 11 in combination with the grates 6, 6a and the cutting slits 12, 12a, it is also possible to select the distribution of the cutting wires 19, as shown in FIG. 4 and 5, a to e.
V mnohých prípadoch, v ktorých by sa rezací drôt 19 dostal do rozsahu roštnice 6 alebo 6a, je možné túto roštnicu odstrániť (napr. obr. 9c, 9e ). U prevažného počtu rozdelení rezacích drôtov 19 je možné súčasne, to je pri rovnakom nastavení drôtov v rezacom ráme, rezať rozdielne formáty (obr. 8a, c, d a e, 9d a e). Pri usporiadaní rezacích drôtov 8e a 9c je možné vždy rezať jednotlivé formáty.In many cases where the cutting wire 19 would fall within the grate 6 or 6a, it can be removed (e.g., Figs. 9c, 9e). With the predominant number of cuts of the cutting wires 19, different formats can be cut simultaneously (i.e., with the same wires in the cutting frame) (Figs. 8a, c, d and e, 9d and e). In the arrangement of the cutting wires 8e and 9c, it is always possible to cut individual formats.
Odborník môže po zoznámení s vynálezom navrhnúť druhé hrúbky rozperných prvkov 11, tak aj ako druhé šírky roštníc 6, 6a rezných štrbín 12, 12a, takže môže docieliť pre rezaní rozdielnych formátov optimálnej vyťaženosti z bloku.One skilled in the art can, after familiarizing with the invention, propose second thicknesses of the spacing elements 11 as well as second widths of the grating 6, 6a of the cutting slots 12, 12a so that they can achieve optimum block utilization for cutting different formats.
V prípade príkladu prevedenia vynálezu s nehybnou pozdĺžnou rámovou pílou 18 sa rozperné kotúče 16 alebo zodpovedajúce kruhové žliabky usporiadajú tak, aby liacovali s ropernými prvákmi priečnych nosníkov 7.In the case of an exemplary embodiment of the invention with a stationary longitudinal frame saw 18, the spacers 16 or the corresponding annular grooves are arranged to mate with the transverse freshmen of the crossbeams 7.
V znázornenom príklade podľa obr. 4a až e a 5a až e sa používa rošt rezacieho lôžka, v ktorom je použité optimálne rozdelenie roštníc 6, 6a v kombinácii s reznými štrbinami 12, 12a v slede týchto prvkov zľava doprava, pričom každá roštnica zapadá medzi dva rozperné kolíky :In the example shown in FIG. 4a to e and 5a to e, a cutting bed grate is used in which an optimal distribution of the grates 6, 6a is used in combination with cutting slots 12, 12a in a sequence of these elements from left to right, each grate fitting between two spacing pins:
U vynálezu nezáleží na použití rozperných kolíkov medzi roštnicami, äle na šírke a rozdelení štrbín medzi roštnicami. Je teda možné napr. použiť profilové roštnice v tvare U v reze, ktoré svojimi ramenami U smerujú nadol a doliehajú na kolíky alebo na mostíky usporiadané na priečnych nosníkoch, takže kolíky alebo mostíky zasahujú do obrátených profilov U.In the present invention, it is irrelevant to the use of spacing pins between the grates, the width and the distribution of the slots between the grates. Thus, e.g. use sectional U-shaped gratings with their U-arms facing down and resting on pins or bridges arranged on the crossbeams, so that the pins or bridges extend into inverted U-profiles.
Claims (20)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995115757 DE19515757C1 (en) | 1995-04-28 | 1995-04-28 | Device for cutting rigid but not hardened quadratic pore concrete block |
Publications (1)
Publication Number | Publication Date |
---|---|
SK52596A3 true SK52596A3 (en) | 1997-05-07 |
Family
ID=7760666
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SK52596A SK52596A3 (en) | 1995-04-28 | 1996-04-25 | Device for cutting solid, still not hardened porous concrete block |
Country Status (5)
Country | Link |
---|---|
CZ (1) | CZ123296A3 (en) |
DE (1) | DE19515757C1 (en) |
NL (1) | NL1002697C2 (en) |
PL (1) | PL180245B1 (en) |
SK (1) | SK52596A3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007034777A1 (en) | 2007-07-25 | 2009-01-29 | Xella Baustoffe Gmbh | Method and device for cross-cutting an aerated concrete block |
DE102007034778A1 (en) | 2007-07-25 | 2009-01-29 | Xella Baustoffe Gmbh | Method and device for longitudinal cutting of an aerated concrete block |
DE102014019532B9 (en) * | 2014-12-23 | 2016-05-04 | Xella Baustoffe Gmbh | Cutting method and cutting system for the transverse and longitudinal cutting of cutting-resistant lightweight concrete cake, in particular pore or foam concrete cake, and method and apparatus for producing lightweight concrete moldings, in particular pore or Schaumbetonformkörpern |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2428115B2 (en) * | 1974-06-11 | 1976-04-22 | Hebel Gasbetonwerk Gmbh, 8080 Emmering | DEVICE FOR CUTTING A STILL PLASTIC PORE CONCRETE BLOCK |
DE2438236B2 (en) * | 1974-08-08 | 1977-03-24 | Georg Willy Ag Maschinenfabrik, Domat, Ems (Schweiz) | CUTTING DEVICE FOR CUTTING A CLAY STRAND OR THE SAME PASTOESE MASS PIECES |
DE3434505C1 (en) * | 1984-09-20 | 1986-03-27 | Hebel GmbH Holding, 8080 Emmering | Device for cutting a still plastic aerated concrete block |
NL8700271A (en) * | 1987-02-04 | 1988-09-01 | Durox Gasbeton Bv | METHOD AND APPARATUS FOR CUTTING GAS CONCRETE. |
-
1995
- 1995-04-28 DE DE1995115757 patent/DE19515757C1/en not_active Expired - Fee Related
-
1996
- 1996-03-25 NL NL1002697A patent/NL1002697C2/en not_active IP Right Cessation
- 1996-04-23 PL PL31390296A patent/PL180245B1/en unknown
- 1996-04-25 SK SK52596A patent/SK52596A3/en unknown
- 1996-04-29 CZ CZ961232A patent/CZ123296A3/en unknown
Also Published As
Publication number | Publication date |
---|---|
NL1002697A1 (en) | 1996-10-29 |
NL1002697C2 (en) | 1997-12-03 |
PL313902A1 (en) | 1996-11-12 |
DE19515757C1 (en) | 1996-09-05 |
PL180245B1 (en) | 2001-01-31 |
CZ123296A3 (en) | 1997-02-12 |
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