EP1151262A1 - Measuring device for continually determining the tensile forces of the chains in the chain conveyor belt of a scraper chain conveyor - Google Patents

Measuring device for continually determining the tensile forces of the chains in the chain conveyor belt of a scraper chain conveyor

Info

Publication number
EP1151262A1
EP1151262A1 EP00910522A EP00910522A EP1151262A1 EP 1151262 A1 EP1151262 A1 EP 1151262A1 EP 00910522 A EP00910522 A EP 00910522A EP 00910522 A EP00910522 A EP 00910522A EP 1151262 A1 EP1151262 A1 EP 1151262A1
Authority
EP
European Patent Office
Prior art keywords
chain
chain link
measuring device
change
link legs
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.)
Withdrawn
Application number
EP00910522A
Other languages
German (de)
French (fr)
Inventor
Norbert Gessner
Reiner Schuster
Mathias Schmidt
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.)
RAG AG
Original Assignee
RAG AG
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 RAG AG filed Critical RAG AG
Publication of EP1151262A1 publication Critical patent/EP1151262A1/en
Withdrawn legal-status Critical Current

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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
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating
    • 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
    • B65G19/00—Conveyors comprising an impeller or a series of impellers carried by an endless traction element and arranged to move articles or materials over a supporting surface or underlying material, e.g. endless scraper conveyors
    • B65G19/18—Details

Definitions

  • Measuring device for the continuous recording of the chain tensile forces in the chain belt of a chain scraper conveyor
  • the invention relates to a method and a measuring device for recording, transferring, shaping and processing a measured variable that represents the current chain strand load of a conveyor chain up to the numerical and / or graphical output of the chain strand load as load information for a chain scraper conveyor operated in the longwall as a continuous conveyor, the chain tensile forces of which are used in hard coal mining from the conveyor drive via chain stars into the chain belt.
  • Known measuring devices for detecting deformations on a chain link of a moving chain strand and forces derived therefrom in the chain are based, for. B. on the attachment of an ohmic transducer to a chain link, the measuring body, in which a measurement signal proportional to this effect is generated from the longitudinal expansion caused on the chain link.
  • the relative change in length of a chain link leg is followed by one or more wire or semiconductor strain gauges attached to the measuring body, which then cause an electrical measuring signal that is proportional to the relative change in resistance by means of a corresponding circuit arrangement of a measuring circuit.
  • portable measuring signal transducer is fed, recorded and further processed until output on a terminal.
  • Such measuring devices are suitable for operational examinations with regard to the location-dependent load extent of the conveyor chain and possibly the conveyor drive.
  • the object is achieved in that the transverse movement caused or prevented under tensile load in the chain strand direction of two related, opposing chain link legs of a chain link is detected directly or indirectly as a change in distance from the relieved state by means of a sensor system, the underlying physical principle of action of which is stable static and good dynamic transmission properties has and within the measuring device a conversion of the sensor signal into an electrical, wirelessly transmissible measuring signal takes place, which after transmission to and reception by a measuring signal receiver is forwarded to a processing and output unit connected downstream thereof for the simultaneous output of the current chain strand load as simultaneously as possible.
  • the display unit arranged in the overall system of the measuring device as the terminal of the measuring chain can, for. B. in the control station area in the mine building or in a mine control room above ground.
  • the measuring devices particularly suitable for applying the method are characterized by the features in the subclaims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Conveyors (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The invention relates to a measuring device and a method for continually determining the tensile forces of the chains in the chain conveyor belt of a scraper chain conveyor in the coal face area in coal mining. Known devices for determining the chain strain of a chain strand which is used in mining and which is moved in the conveyor are based on sensors being mounted on a chain link. When the chain link is stretched, a measuring signal is generated which is proportional to the stretching effect. Said signal is fed to a moveable receiving device that accompanies the measuring point and can be used as a storage unit, whereby the signal is fed via measuring lines. Said signal is received and processed. Information on the strains is thus provided with tremendous delay and involving high costs. The aim of the invention is to provide a method and measuring devices which enable to continuously determine the tensile forces of the chains in the chain conveyor belt of an operating scraper chain conveyor in order to almost simultaneously determine the strain ratio of the chain conveyor belt in relation to the permissible strain. According to the inventive method and said measuring devices, the deformation of the cribs of the chain links in relation to one another is determined as a change in distance in relation to zero strain, whereby said deformation is caused in a chain link and under strain. Said deformation is transformed into an electrical measuring signal that can be transmitted wirelessly and is transmitted to an output device for simultaneously outputting the strain.

Description

Meßeinrichtung zur kontinuierlichen Erfassung der Kettenzugkräfte im Kettenband eines KettenkratzförderersMeasuring device for the continuous recording of the chain tensile forces in the chain belt of a chain scraper conveyor
Die Erfindung betrifft ein Verfahren und eine Meßeinrichtung zur Erfassung, Übertragung, Umformung und Verarbeitung einer, die momentane Kettenstrangbelastung einer Fördererkette abbildende Meßgröße bis zur zahlenmäßigen und/oder zeichnerischen Ausgabe der Kettenstrangbelastung als Belastungsinformation für einen im Streb als Stetigförderer betriebenen Kettenkratzerförderer, dessen Kettenzugkräfte im Steinkohlenbergbau vom Fördererantrieb über Kettensterne in das Kettenband eingeleitet werden.The invention relates to a method and a measuring device for recording, transferring, shaping and processing a measured variable that represents the current chain strand load of a conveyor chain up to the numerical and / or graphical output of the chain strand load as load information for a chain scraper conveyor operated in the longwall as a continuous conveyor, the chain tensile forces of which are used in hard coal mining from the conveyor drive via chain stars into the chain belt.
Bekannte Meßeinrichtungen zur Erfassung von Verformungen an einem Kettenglied eines bewegten Kettenstranges und daraus ableitbaren Kräften in der Kette beruhen z. B. auf dem Anbringen eines ohmschen Meßwertaufnehmers an einem Kettenglied, dem Meßkδrper, bei welchem aus der am Kettenglied hervorgerufenen Längsdehnung ein zu dieser Wirkung proportionales Meßsignal erzeugt wird.Known measuring devices for detecting deformations on a chain link of a moving chain strand and forces derived therefrom in the chain are based, for. B. on the attachment of an ohmic transducer to a chain link, the measuring body, in which a measurement signal proportional to this effect is generated from the longitudinal expansion caused on the chain link.
Dabei wird die relative Längenänderung eines Kettengliedschenkels von einem oder mehreren auf dem Meßkörper befestigten Draht- oder Halbleiter-Dehnungsmeßstreifen mitvollzogen, die dann durch eine entsprechende Schaltungsanordnung einer Meßschaltuπg ein der relativen Widerstandsänderung verhältnisgleiches elektrisches Meßsignal bewirken, welches über Meßleitungen einem die Meßstelle begleitenden, speicherfähigen, transportablen Meßsignalaufnehmer zugeführt, aufgenommen und weiterverarbeitet wird bis zur Ausgabe auf einem Endgerät .The relative change in length of a chain link leg is followed by one or more wire or semiconductor strain gauges attached to the measuring body, which then cause an electrical measuring signal that is proportional to the relative change in resistance by means of a corresponding circuit arrangement of a measuring circuit. portable measuring signal transducer is fed, recorded and further processed until output on a terminal.
Auf diese Art und Weise wird mit erheblichem Zeitverzug eine Auswertung der empfangenen Meßsignale, z. B. an einem PC-Arbeitsplatz, möglich. Derartige Meßeinrichtungen eignen sich für Betriebsuntersuchungen hinsichtlich des ortsabhängigen Belastungsausmaßes der Fördererkette und gegebenenfalls des Fördererantriebes.In this way, an evaluation of the received measurement signals, z. B. at a PC workstation possible. Such measuring devices are suitable for operational examinations with regard to the location-dependent load extent of the conveyor chain and possibly the conveyor drive.
Die Nachteile sind für vorgesehene Belastungsinformationen im Dauerbetrieb offensichtlich, denn jede erlangte Belastungsinformation, beruhend auf der Meßsignalauswertung zur Kettenbelastung und damit zum Betriebsgeschehen kommt erheblich verspätet einem Entscheidungsträger zur Kenntnis und verhindert somit einen zur aktuellen Belastung zeitgerechten Betriebseingriff für eine eventuell erforderliche, belastungssgerechte Anpassung an den aktuellen Belastungszustand.The disadvantages are obvious for the intended load information in continuous operation, because any load information obtained, based on the measurement signal evaluation for chain load and thus for the operational process, comes to the attention of a decision maker considerably late and thus prevents an operational intervention that is timely for the current load for a possibly necessary, load-appropriate adjustment to the current load condition.
Aufgabe der vorliegenden Erfindung ist es deshalb, ein Verfahren und Meßeinrichtungen anzugeben, die es ermöglichen, an einem im Betrieb bewegten Kettenband eines im Ge- wmnungsbetrieb eingerichteten Kettenkratzförderers, die Kettenzugkräfte indirekt oder direkt, stetig zu erfassen, um das Belastungsausmaß an einem oder mehreren Kettensträngen des Kettenbandes in Bezug auf die zulässige Belastung nahezu simultan zur momentanen Belastung zu erfahren und ausgeben zu können.It is therefore the object of the present invention to provide a method and measuring devices which make it possible, on a chain conveyor moving during operation of a chain scraper conveyor set up during the operation, to continuously or indirectly record the chain tensile forces in order to measure the load on one or more chain strands of the chain belt in relation to the permissible load to be experienced and output almost simultaneously with the current load.
Die Aufgabe wird dadurch gelöst, daß die unter Zugbelastung in Kettenstrangrichtung verursachte oder verhinderte Querbewegung zweier zusammengehöriger, einander gegenüberliegender Kettengliedschenkel eines Kettengliedes direkt oder indirekt als Abstandsänderung gegenüber dem entlasteten Zustand mittels eines Sensorsystems erfaßt wird, dessen zugrundeliegendes physikalisches Wirkprinzip stabile statische und gute dynamische Übertragungseigenschaften aufweist und innerhalb der Meßeinrichtung eine Umformung des Sensorsignales in ein elektrisches , drahtlos übertragbares Meßsignal erfolgt, das nach Sendung an und Empfang durch einen Meßsignalempfänger, an eine diesem nachgeschaltete Verarbeitungs- und Ausgabeeinheit zur möglichst simultanen Ausgabe der augenblicklichen Kettenstrangbelastung weiterübermittelt wird .The object is achieved in that the transverse movement caused or prevented under tensile load in the chain strand direction of two related, opposing chain link legs of a chain link is detected directly or indirectly as a change in distance from the relieved state by means of a sensor system, the underlying physical principle of action of which is stable static and good dynamic transmission properties has and within the measuring device a conversion of the sensor signal into an electrical, wirelessly transmissible measuring signal takes place, which after transmission to and reception by a measuring signal receiver is forwarded to a processing and output unit connected downstream thereof for the simultaneous output of the current chain strand load as simultaneously as possible.
Die im Gesamtsystem der Meßeinrichtung als Endgerät der Meßkette angeordnete Anzeigeeinheit kann sich z. B. im Steuerstandbereich im Grubengebäude oder in einer Grubenwarte Übertage befinden.The display unit arranged in the overall system of the measuring device as the terminal of the measuring chain can, for. B. in the control station area in the mine building or in a mine control room above ground.
Die zur Anwendung des Verfahrens besonders geeigneten Meßeinrichtungen sind durch die Merkmale in den Unteransprüchen gekennzeichnet .The measuring devices particularly suitable for applying the method are characterized by the features in the subclaims.
Zur drahtlosen Übertragung selbst werden im Bergbau marktübliche Übertragungssysteme verwendet.Conventional transmission systems are used in the mining industry for wireless transmission itself.
Diejenigen Teile der Meßeinrichtung, die innerhalb des Grubengebäudes, also Untertage, eingesetzt werden, erfordern aus Sicherheitsgründen eine eigensichere Ausführung. Those parts of the measuring device that are used inside the mine building, i.e. underground, require an intrinsically safe design for safety reasons.

Claims

Patentansprüche claims
1. Verfahren zur Erfassung, Übertragung, Umformung und Verarbeitung einer, die momentane Kettenstrangbelastung einer Fördererkette abbildende Meßgröße bis zur zahlenmäßigen und/oder zeichnerischen Ausgabe der Kettenstrangbelastung als Belastungsinformation für einen im Streb als Stetigförderer betriebenen Kettenkratzförderer, .dessen Kettenzugkräfte im Steinkohlenbergbau vom Fördererantrieb 'über Kettensterne in das Kettenband eingeleitet werden, d a d u r c h g e k e n n z e i c h n e t, d a ß die unter Zugbelastung in Kettenstrangrich- tung verursachte oder verhinderte Querbewegung zweier zusammengehöriger, einander gegenüberliegender Kettengliedschenkel eines Kettengliedes direkt oder indirekt als Abstandsänderung gegenüber dem entlasteten Zustand mittels eines Sensorsystems erfaßt wird, dessen zugrundeliegendes physikalisches Wirkprinzip stabile statische und gute dynamische Übertragungseigenschaften aufweist und innerhalb der Meßeinrichtung eine Umformung des Sensorsignales in ein elektrisches, drahtlos übertragbares Meßsignal erfolgt, das nach Sendung an und Empfang durch einen Meßsignalempfänger an eine diesem nachgeschaltete Verarbeitungs- und Ausgabeeinheit zu einer möglichst simultanen Ausgabe der augenblicklichen Kettenstrangbelastung weiterübermittelt wird . Meßeinrichtung zur Erfassung, Übertragung, Umformung und Verarbeitung einer, die momentane Kettenstrangbelastung einer Fördererkette abbildende Meßgröße bis zur zahlenmäßigen und/oder zeichnerischen Ausgabe der Kettenstrangbelastung als Belastungsinformation für einen im Streb als Stetigförderer betriebenen Ketten- kratzförderer , dessen Kettenzugkräfte im Steinkohlenbergbau vom Fδrdererantrieb über Kettensterne in das Kettenband eingeleitet werden, d a d u r c h g e k e n n z e i c h n e t, d a ß die unter Zugbelastung in Kettenstrangrich- tung verursachte oder verhinderte Querbewegung zweier zusammengehöriger, einander gegenüberliegender Kettengliedschenkel eines Kettengliedes direkt oder indirekt als Abstandsänderung gegenüber dem entlasteten Zustand mittels eines Sensorsystems erfaßt wird, dessen zugrundeliegendes physikalisches Wirkprinzip stabile statische und gute dynamische Übertragungseigenschaften aufweist und innerhalb der Meßeinrichtung eine Umformung des Sensorsignales in ein elektrisches, drahtlos übertragbares Meßsignal erfolgt, das nach Sendung an und Empfang durch einen Meßsignalempfänger an eine diesem nachgeschaltete Verarbeitungs- und Ausgabeeinheit zu einer möglichst simultanen Ausgabe der augenblicklichen Kettenstrangbelastung weiterübermittelt wird. Meßeinrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, d a ß die verhinderte Abstandsänderung zwischen den Kettengliedschenkeln über zwischen den Kettengliedschenkeln angeordnete piezoelektrische Sensoren oder Aufnehmer mit elektronischem Analogausgang in Form einer Ladung indirekt über den Druck- oder die Krafteinwirkung der beiden Kettengliedschenkel zueinander erfaßt wird.1.Procedure for recording, transferring, shaping and processing a measured quantity that represents the current chain strand load of a conveyor chain up to the numerical and / or graphical output of the chain strand load as load information for a chain scraper conveyor operated in the longwall as a continuous conveyor, meanwhile chain tensile forces in the coal mine from the conveyor drive Chain stars are introduced into the chain belt, characterized in that the transverse movement caused or prevented under tensile load in the direction of the chain strand is detected directly or indirectly as a change in distance from the relieved state by means of a sensor system, the underlying physical principle of action of which is stable, as a change in distance from the relieved state has static and good dynamic transmission properties and a transformation of the sensor signal into a within the measuring device Electrical, wirelessly transferable measurement signal takes place, which is transmitted after transmission to and reception by a measurement signal receiver to a downstream processing and output unit for simultaneous output of the current chain strand load as simultaneously as possible. Measuring device for recording, transferring, shaping and processing a measured quantity which represents the current chain strand load of a conveyor chain up to the numerical and / or graphical output of the chain strand load as load information for a chain scraper conveyor operated in the longwall as a continuous conveyor, the chain tensile forces in the coal industry from the conveyor drive via chain stars in the chain belt are introduced, characterized in that the transverse movement caused or prevented under tensile load in the chain strand direction is detected directly or indirectly as a change in distance from the relieved state by means of a sensor system, the underlying physical principle of action of which is static and stable has good dynamic transmission properties and a transformation of the sensor signal within the measuring device An electrical, wirelessly transferable measurement signal takes place, which after transmission to and reception by a measurement signal receiver is forwarded to a processing and output unit downstream of the latter for a simultaneous output of the current chain strand load as simultaneously as possible. Measuring device according to claim 2, characterized in that ß the prevented change in distance between the chain link legs via piezoelectric sensors or transducers arranged between the chain link legs with electronic analog output in the form of a charge is detected indirectly via the pressure or force of the two chain link legs to each other.
Meßeinrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, d a ß die Abstandsänderung zwischen den Kettengliedschenkeln durch zwischen den Kettengliedschenkeln angeordnete piezoresitive Sensoren oder Aufnehmer mit elektronischem Analogausgang in Form einer Widerstandsänderung oder Spannung indirekt über den Druck- oder die Krafteinwirkung der beiden Kettengliedschenkel zueinander erfaßt wird.Measuring device according to claim 2, d a d u r c h g e k e n n z e i c h n e t, that the change in distance between the chain link legs by piezoresitive sensors arranged between the chain link legs or transducers with electronic analog output in the form of a change in resistance or voltage indirectly to one another via the pressure or force of the two chain link legs.
Meßeinrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, d a ß die Abstandsänderung zwischen den Kettengliedschenkeln durch zwischen den Kettengliedschenkeln angeordnete induktive Sensoren mit Tauchanker mit elektronischem Analogausgang in Form einer Induktivitätsänderung oder einer Wechselspannung direkt über den Weg der beiden Kettengliedschenkel zueinander erfaßt wird. Meßeinrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, d a ß die Abstandsänderung zwischen den Ketten- gliedschenkeln durch zwischen den Kettengliedschenkeln angeordnete induktive Sensoren mit Queranker mit elektronischem Analogausgang in Form einer Induktivität indirekt über den Weg der beiden Kettengliedschenkel zueinander erfaßt wird.Measuring device according to claim 2, characterized in that the change in distance between the chain link legs is detected by inductive sensors arranged between the chain link legs with a plunger anchor with electronic analog output in the form of an inductance change or an alternating voltage directly via the path of the two chain link legs to one another. Measuring device according to claim 2, characterized in that the change in distance between the chain link legs is detected indirectly via the path of the two chain link legs by inductive sensors with transverse anchors arranged between the chain link legs with an electronic analog output in the form of an inductor in the form of an inductor.
Meßeinrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, d a ß die verhinderte Abstandsänderung zwischen den Kettengliedschenkeln durch zwischen den Kettengliedschenkeln angeordnete magnetoelastische Sensoren mit elektronischem Analogausgang in Form einer Permeabilitätsänderung indirekt über die Kraft der beiden Kettengliedschenkel zueinander erfaßt wird.Measuring device according to claim 2, d a d u r c h g e k e n n z e i c h n e t, that the prevented change in distance between the chain link legs by means of magnetoelastic sensors arranged between the chain link legs with electronic analog output in the form of a change in permeability indirectly to one another via the force of the two chain link legs.
Meßeinrichtung nach einem der Ansprüche 2 bis 7, d a d u r c h g e k e n n z e i c h n e t, d a ß die im Untertagebetrieb eingesetzte Meßeinrichtung eigensicher ausgeführt ist . Measuring device according to one of claims 2 to 7, d a d u r c h g e k e n n z e i c h n e t, that the measuring device used in underground operation is intrinsically safe.
EP00910522A 1999-02-10 2000-02-02 Measuring device for continually determining the tensile forces of the chains in the chain conveyor belt of a scraper chain conveyor Withdrawn EP1151262A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19905461 1999-02-10
DE19905461A DE19905461B4 (en) 1999-02-10 1999-02-10 Measuring device for the continuous detection of chain tension forces in the chain belt of a chain scraper conveyor
PCT/DE2000/000311 WO2000047968A1 (en) 1999-02-10 2000-02-02 Measuring device for continually determining the tensile forces of the chains in the chain conveyor belt of a scraper chain conveyor

Publications (1)

Publication Number Publication Date
EP1151262A1 true EP1151262A1 (en) 2001-11-07

Family

ID=7897015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00910522A Withdrawn EP1151262A1 (en) 1999-02-10 2000-02-02 Measuring device for continually determining the tensile forces of the chains in the chain conveyor belt of a scraper chain conveyor

Country Status (6)

Country Link
EP (1) EP1151262A1 (en)
CZ (1) CZ20012905A3 (en)
DE (1) DE19905461B4 (en)
PL (1) PL349887A1 (en)
UA (1) UA51852C2 (en)
WO (1) WO2000047968A1 (en)

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EP2311575A2 (en) 2009-10-13 2011-04-20 Ing. Erich Pfeiffer GmbH Dispenser
CN107215620A (en) * 2017-06-28 2017-09-29 太仓秦风广告传媒有限公司 A kind of drag conveyor automatic checkout system

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CN105621060B (en) * 2016-03-08 2018-01-02 中交机电工程局有限公司 A kind of sealing-tape machine tensile force real-time detection apparatus
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CN108072533B (en) * 2017-11-30 2019-10-11 太原理工大学 A kind of experimental provision and method detecting drag conveyor dynamic characteristic
CN117232711B (en) * 2023-11-14 2024-01-30 山西省长治经坊煤业有限公司 Coal-winning machine pull rod pretightning force detection device

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2311575A2 (en) 2009-10-13 2011-04-20 Ing. Erich Pfeiffer GmbH Dispenser
DE102009049903A1 (en) 2009-10-13 2011-04-21 Ing. Erich Pfeiffer Gmbh discharge
CN107215620A (en) * 2017-06-28 2017-09-29 太仓秦风广告传媒有限公司 A kind of drag conveyor automatic checkout system
CN107215620B (en) * 2017-06-28 2019-07-23 嵊州市万智网络科技有限公司 A kind of drag conveyor automatic checkout system

Also Published As

Publication number Publication date
DE19905461B4 (en) 2006-06-14
DE19905461A1 (en) 2000-08-24
PL349887A1 (en) 2002-09-23
UA51852C2 (en) 2002-12-16
WO2000047968A1 (en) 2000-08-17
CZ20012905A3 (en) 2002-01-16

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