WO1993012398A1 - Wasserlanzenbläser zur reinigung von wärmeübertragern - Google Patents
Wasserlanzenbläser zur reinigung von wärmeübertragern Download PDFInfo
- Publication number
- WO1993012398A1 WO1993012398A1 PCT/DE1992/001050 DE9201050W WO9312398A1 WO 1993012398 A1 WO1993012398 A1 WO 1993012398A1 DE 9201050 W DE9201050 W DE 9201050W WO 9312398 A1 WO9312398 A1 WO 9312398A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spindle
- vertical spindle
- water lance
- combustion chamber
- lance blower
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/04—Feeding and driving arrangements, e.g. power operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
- F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
Definitions
- the invention relates to a water lance blower for cleaning heat exchangers, in particular a combustion chamber heating surface in steam boilers, the mouth of which is pivotally mounted in the wall of the steam boiler and is pivotally suspended at its rear part.
- the blow pipe which has a blow nozzle in the center, is connected in an articulated manner via a roller guide to a drive which carries out superimposed movements.
- the water lance blower is moved up to an open hatch or the blow pipe is inserted into the combustion chamber through a piece of pipe stored in the hatch.
- the water lance blower is swung out after the cyclical cleaning process or retracted linearly backwards. This requires complex mechanics that are prone to failure, which also makes automation of the cleaning process very difficult.
- these solutions require multiple redirections of the water supply system, which are associated with high pressure losses.
- blow-through cylinder is rigidly flanged to the blow nozzle at the front and the mouth of the blow nozzle is inserted into the blow-by cylinder, the blow-through cylinder is rigidly fixed in the ball joint formed from a ball segment and is slotted in its free part or provided with bores.
- the invention has for its object to provide a water lance blower, which is pivotally mounted with its mouth in the wall of the steam boiler and is pivotally suspended at its rear end, so that there is movement in the plane on all sides without contamination and the occurring Beam on the opposite wall of the boiler describes a precisely defined path.
- a flange is provided at the mouth of the blowpipe which is attached to a segment of a universal joint and the universal joint is fastened in the combustion chamber wall
- the rear part of the blowpipe is arranged in a guide which is vertically displaceable on a vertical spindle is, the vertical spindle above and below is horizontally displaceable on a horizontal spindle and the guide is formed from a housing that does not rotate on the vertical spindle and carries a fork-shaped receptacle on the side, in which a gimbal-shaped cage is arranged , which is formed in its inner part as a sleeve and receives the blow tube axially displaceable therein.
- the vertical spindle is surrounded by a fixed protective tube with a longitudinal groove, a threaded nut with a feather key is arranged on the vertical spindle, the feather key being guided in the longitudinal groove and projecting from this a socket on which the housing sits.
- the vertical spindle is driven by a gear motor.
- the housing and the receptacle are advantageously formed from one part and the feather key is T-shaped formed, attached with its flange to the outside of the housing and guided with the shaft through the housing into the threaded nut.
- the vertical and horizontal spindles are surrounded by a bellows or a spiral protection spring.
- Both horizontal spindles are supported at their ends in a front and rear box, the upper spindle is driven by a gear motor and the lower spindle is connected to the upper spindle by a chain in the rear box.
- FIG. 1 shows a front view of the water lance blower
- FIG. 2 a side view according to FIG. 1
- Fig. 5 another variant of the guide for the blow pipe in a partial section
- the water lance blower consists essentially of a blow pipe 1, a universal joint 3, a guide 5, a vertical spindle 6 and two horizontal spindles 7; 8.
- the blow pipe 1 sits flush with its mouth in a flange which is attached to a segment of the universal joint 3.
- the universal joint 3 is fastened in a hatch of the combustion chamber wall 4 by means of several bolts.
- the rear part of the blow pipe 1 is seated in the guide 5, which is arranged on the vertical spindle 6 so as to be vertically displaceable.
- the vertical spindle 6 is on top of the horizontal spindle
- the vertical spindle 6 is driven by a geared motor 20.
- the guide 5 consists of a housing 9 which is not rotatably seated on the vertical spindle 6 and on the side carries a fork-shaped receptacle 10 in which a cardan-shaped cage 11 is arranged.
- the cage 11 is formed in its inner part as a sleeve 12 and receives the blow tube 1 axially displaceable therein.
- 12 bushings 21 are provided at both ends of the sleeve.
- the vertical spindle 6 is surrounded by a fixed protective tube 22 which is provided with a longitudinal groove.
- a threaded nut 23 with a feather key 2 is arranged on the spindle 6.
- the feather key 2 is guided in the longitudinal groove, protrudes out of this and receives a socket 13 on which the housing 9 sits.
- the vertical spindle 6 is surrounded by a bellows or a spiral protective spring 14.
- Both horizontal spindles 7; 8 are also surrounded by a bellows or a spiral protection spring 14. Both horizontal spindles 7; 8 are at their ends in a box 18; 19 stored. The upper horizontal spindle 7 is driven by a geared motor 17. The lower spindle 8 is connected to the upper spindle 7 by a chain in the rear box 19.
- the housing 9 and the receptacle 10 are advantageously formed from one part, in particular from a cast part.
- the feather key 2 is T-shaped and with its flange 24 is screwed onto the housing 9 from the outside. With the shaft 25, the feather key 2 is guided through the housing 9 into the threaded nut 23 (FIG. 6).
- the previous protective tube 22 serves as a guide 5 for the parallel key 2 actuated by the threaded nut 23.
- the bushing 13 which has been continuous so far is divided into two and is only inserted into the housing 9 at both ends.
- the feather key 2 which wears during the course of the movement and must be replaced at larger intervals, can be replaced more easily.
- the screw connection of the flange 24 to the housing 9 only has to be loosened, the key 2 removed and replaced with a new one.
- the water lance blower works as follows:
- the blow pipe 1 is pivoted by actuating the vertical spindle 6 with the aid of the geared motor 20 and the horizontal spindles 7; 8 by means of the geared motor 17.
- the guide 5 executes a meandering movement with the blowpipe 1, which in the same way is mirrored by the water jet on the opposite combustion chamber wall. Due to the non-rotatable housing 9, the center of rotation of the blowpipe 1 is always in the plane of movement of the vertical spindle 6, but the blowpipe 1 can carry out all the necessary movements by being mounted in the gimbal-shaped cage 11.
- the area of application of the water lance blower according to the invention is significantly increased.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Washing And Drying Of Tableware (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Cookers (AREA)
- Nozzles (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51052193A JP3155553B2 (ja) | 1991-12-18 | 1992-12-09 | 熱交換器を掃除するための槍型水吹き出し装置 |
AU30811/92A AU672375B2 (en) | 1991-12-18 | 1992-12-09 | Water lance blower for cleaning heat exchangers |
KR1019940702090A KR100265920B1 (ko) | 1991-12-18 | 1992-12-09 | 열교환기를 세척하기 위한 관형 물 분사기 |
RU94030374/06A RU2100736C1 (ru) | 1991-12-18 | 1992-12-09 | Водоразбрызгивающая трубка для очистки теплоносителей |
DE59206325T DE59206325D1 (de) | 1991-12-18 | 1992-12-09 | Wasserlanzenbläser zur reinigung von wärmeübertragern |
EP92924572A EP0616680B1 (de) | 1991-12-18 | 1992-12-09 | Wasserlanzenbläser zur reinigung von wärmeübertragern |
SK728-94A SK281985B6 (sk) | 1991-12-18 | 1992-12-09 | Zariadenie na striekanie vodným lúčom |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4142448.4 | 1991-12-18 | ||
DE4142448A DE4142448A1 (de) | 1991-12-18 | 1991-12-18 | Wasserlanzenblaeser zur reinigung von waermeuebertragern |
DEP4239410.4 | 1992-11-17 | ||
DE4239410A DE4239410C2 (de) | 1991-12-18 | 1992-11-17 | Wasserlanzenbläser zur Reinigung von Wärmeübertragern |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1993012398A1 true WO1993012398A1 (de) | 1993-06-24 |
WO1993012398A9 WO1993012398A9 (de) | 1994-09-15 |
Family
ID=25910402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1992/001050 WO1993012398A1 (de) | 1991-12-18 | 1992-12-09 | Wasserlanzenbläser zur reinigung von wärmeübertragern |
Country Status (20)
Country | Link |
---|---|
US (1) | US5503115A (de) |
EP (1) | EP0616680B1 (de) |
JP (1) | JP3155553B2 (de) |
KR (1) | KR100265920B1 (de) |
CN (1) | CN1053041C (de) |
AT (1) | ATE138190T1 (de) |
AU (1) | AU672375B2 (de) |
CA (1) | CA2126184A1 (de) |
CZ (1) | CZ281762B6 (de) |
DE (2) | DE4239410C2 (de) |
DK (1) | DK0616680T3 (de) |
ES (1) | ES2089582T3 (de) |
HR (1) | HRP921429B1 (de) |
HU (1) | HU217469B (de) |
RU (1) | RU2100736C1 (de) |
SI (1) | SI9200394B (de) |
SK (1) | SK281985B6 (de) |
TR (1) | TR26991A (de) |
WO (1) | WO1993012398A1 (de) |
YU (1) | YU48339B (de) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996038704A1 (de) * | 1995-05-30 | 1996-12-05 | Clyde Bergemann Gmbh | Wasserlanzenbläser mit verkürzter wasserlanze |
WO1996038701A1 (de) * | 1995-05-30 | 1996-12-05 | Clyde Bergemann Gmbh | Verfahren zur reinigung vorgebbarer flächen eines beheizbaren innenraumes sowie zugehöriger wasserlanzenbläser |
WO1996038702A1 (de) * | 1995-05-30 | 1996-12-05 | Clyde Bergemann Gmbh | Antriebssystem für wasserlanzenbläser mit gehäuse für sperr- und spülmedium und verfahren zum betrieb |
US5925193A (en) * | 1995-05-30 | 1999-07-20 | Clyde Bergemann Gmbh | Method for cleaning pre-determinable surfaces of a heatable internal chamber and associated water lance blower |
US6035811A (en) * | 1995-05-30 | 2000-03-14 | Clyde Bergemann Gmbh | Water lance blower positioning system |
WO2001065179A1 (de) | 2000-03-01 | 2001-09-07 | Clyde Bergemann Gmbh | Kompakter wasserlanzenbläser |
WO2002021064A2 (de) | 2000-09-11 | 2002-03-14 | Clyde Bergemann Gmbh | Kugelgelenk-lagerung für eine wasserlanze eines wasserlanzenbläsers |
WO2007062477A1 (en) * | 2005-11-30 | 2007-06-07 | Mack Innovations Pty Ltd | Water lance assembly |
DE102004010771B4 (de) * | 2004-03-05 | 2015-09-24 | Bilfinger Rosink Gmbh | Vorrichtung zum Bewegen eines Blasrohres |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4415010A1 (de) * | 1994-04-29 | 1995-11-02 | Bergemann Gmbh | Verfahren zur Führung eines langgestreckten Elementes |
US6639962B2 (en) * | 1998-08-12 | 2003-10-28 | Hitachi, Ltd. | Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel |
US6418948B1 (en) | 1998-10-30 | 2002-07-16 | Thomas G. Harmon | Apparatus and method for removing concrete from interior surfaces of a concrete mixing drum |
ATE262671T1 (de) | 1999-07-08 | 2004-04-15 | Vattenfall Europe Generation | Wasserlanzenbläser zur reinigung von wärmeübertragern, insbesondere einer brennkammerheizfläche |
DE19946188C1 (de) * | 1999-09-21 | 2001-05-31 | Ver Energiewerke Ag | Wasserlanzenbläser zum Reinigen eines Dampfkessels |
WO2002019492A1 (en) | 2000-08-31 | 2002-03-07 | Clyde Bergemann, Inc. | Sootblower lance port with leak resistant cardon joint |
US6655397B2 (en) | 2001-03-27 | 2003-12-02 | Diamond Power International, Inc. | Articulating water monitor cleaning device |
US6969354B1 (en) * | 2001-09-25 | 2005-11-29 | Acuson Corporation | Adaptable intraoperative or endocavity ultrasound probe |
US7026598B1 (en) | 2002-02-20 | 2006-04-11 | Clyde Bergemann, Inc. | Vector-based targeting control for a water cannon |
US7637129B2 (en) * | 2007-10-04 | 2009-12-29 | Sheng-Ming Wang | Air jet pressurized clothes washing machine |
US8974607B2 (en) * | 2011-12-28 | 2015-03-10 | Saudi Arabian Oil Company | Cleaning apparatus for heat exchange tubes of air cooled heat exchangers |
CN104180710A (zh) * | 2013-05-22 | 2014-12-03 | 天津市通洁高压泵制造有限公司 | 基于高压水射流的蒸发器自动清洗系统 |
CN103353255B (zh) * | 2013-06-04 | 2017-05-10 | 安徽华速机器人科技有限公司 | 一种凝汽器在线清洗机器人喷头反锁结构 |
CN103822531B (zh) * | 2014-03-11 | 2015-07-22 | 刘胜伟 | 一种地暖管疏通装置及其使用方法 |
CN109013603A (zh) * | 2018-07-04 | 2018-12-18 | 合肥欧语自动化有限公司 | 一种化工设备用的清洗装置 |
CN113008071B (zh) * | 2021-02-19 | 2022-07-08 | 安徽理工大学 | 冷凝器清洗机器人用送枪装置 |
US20220410222A1 (en) * | 2021-06-24 | 2022-12-29 | Path Environmental Technology, LLC | Apparatus for Cleaning a Surface with a Liquid Jet and Related Methods |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB272186A (en) * | 1926-06-05 | 1927-11-10 | Daniel Guggenheim | Multiple tube cleaner |
FR1362718A (fr) * | 1963-05-07 | 1964-06-05 | Diamond Power Speciality | Perfectionnements aux ensembles de souffleur de suie |
US3354490A (en) * | 1964-06-15 | 1967-11-28 | Power Tube Inc | Boiler tube cleaning apparatus |
DD145476A3 (de) * | 1979-02-12 | 1980-12-17 | Friedrich Bude | Vorrichtung zur reinigung von waermeuebertragern |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE145476C (de) * | ||||
DE235102C (de) * | ||||
US1550943A (en) * | 1922-01-11 | 1925-08-25 | Baker Steam Motor Car And Mfg | Water-tube boiler |
DE1751511A1 (de) * | 1968-06-11 | 1971-03-18 | Hans Bergmann | Abdichtung fuer laengsverschiebbare und drehbare Duesenrohre bei Russblaesern |
DD226061A1 (de) * | 1983-07-14 | 1985-08-14 | Orgreb Inst Kraftwerke | Verfahren und anordnung zum betrieb eines wasserlanzenblaesers |
FR2662956A1 (fr) * | 1990-06-11 | 1991-12-13 | Fives Cail Babcock | Dispositif de lavage notamment pour appareil de cristallisation a marche continue. |
DE4142448A1 (de) * | 1991-12-18 | 1993-07-08 | Ver Energiewerke Ag | Wasserlanzenblaeser zur reinigung von waermeuebertragern |
US5337441A (en) * | 1993-02-10 | 1994-08-16 | Mitsubishi Jukogyo Kabushiki Kaisha | Extraction/insertion type soot blowing apparatus |
-
1992
- 1992-11-17 DE DE4239410A patent/DE4239410C2/de not_active Expired - Lifetime
- 1992-12-09 DK DK92924572.8T patent/DK0616680T3/da active
- 1992-12-09 ES ES92924572T patent/ES2089582T3/es not_active Expired - Lifetime
- 1992-12-09 JP JP51052193A patent/JP3155553B2/ja not_active Expired - Fee Related
- 1992-12-09 KR KR1019940702090A patent/KR100265920B1/ko not_active IP Right Cessation
- 1992-12-09 HU HU9401827A patent/HU217469B/hu unknown
- 1992-12-09 DE DE59206325T patent/DE59206325D1/de not_active Expired - Lifetime
- 1992-12-09 WO PCT/DE1992/001050 patent/WO1993012398A1/de active IP Right Grant
- 1992-12-09 SK SK728-94A patent/SK281985B6/sk not_active IP Right Cessation
- 1992-12-09 EP EP92924572A patent/EP0616680B1/de not_active Expired - Lifetime
- 1992-12-09 AU AU30811/92A patent/AU672375B2/en not_active Expired
- 1992-12-09 CZ CZ941497A patent/CZ281762B6/cs not_active IP Right Cessation
- 1992-12-09 CA CA002126184A patent/CA2126184A1/en not_active Abandoned
- 1992-12-09 AT AT92924572T patent/ATE138190T1/de not_active IP Right Cessation
- 1992-12-09 RU RU94030374/06A patent/RU2100736C1/ru active
- 1992-12-16 SI SI9200394A patent/SI9200394B/sl unknown
- 1992-12-17 HR HRP4239410.4A patent/HRP921429B1/xx not_active IP Right Cessation
- 1992-12-18 CN CN92115326.0A patent/CN1053041C/zh not_active Expired - Lifetime
- 1992-12-18 YU YU108092A patent/YU48339B/sh unknown
- 1992-12-18 TR TR01248/92A patent/TR26991A/xx unknown
-
1994
- 1994-06-17 US US08/275,823 patent/US5503115A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB272186A (en) * | 1926-06-05 | 1927-11-10 | Daniel Guggenheim | Multiple tube cleaner |
FR1362718A (fr) * | 1963-05-07 | 1964-06-05 | Diamond Power Speciality | Perfectionnements aux ensembles de souffleur de suie |
US3354490A (en) * | 1964-06-15 | 1967-11-28 | Power Tube Inc | Boiler tube cleaning apparatus |
DD145476A3 (de) * | 1979-02-12 | 1980-12-17 | Friedrich Bude | Vorrichtung zur reinigung von waermeuebertragern |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996038704A1 (de) * | 1995-05-30 | 1996-12-05 | Clyde Bergemann Gmbh | Wasserlanzenbläser mit verkürzter wasserlanze |
WO1996038701A1 (de) * | 1995-05-30 | 1996-12-05 | Clyde Bergemann Gmbh | Verfahren zur reinigung vorgebbarer flächen eines beheizbaren innenraumes sowie zugehöriger wasserlanzenbläser |
WO1996038703A1 (de) * | 1995-05-30 | 1996-12-05 | Clyde Bergemann Gmbh | Antriebssystem für einen wasserlanzenbläser |
WO1996038702A1 (de) * | 1995-05-30 | 1996-12-05 | Clyde Bergemann Gmbh | Antriebssystem für wasserlanzenbläser mit gehäuse für sperr- und spülmedium und verfahren zum betrieb |
US5925193A (en) * | 1995-05-30 | 1999-07-20 | Clyde Bergemann Gmbh | Method for cleaning pre-determinable surfaces of a heatable internal chamber and associated water lance blower |
US6035811A (en) * | 1995-05-30 | 2000-03-14 | Clyde Bergemann Gmbh | Water lance blower positioning system |
US6073641A (en) * | 1995-05-30 | 2000-06-13 | Bude; Friedrich | Drive system for a water lance blower with a housing for blocking and flushing medium and a method for its operation |
US6101985A (en) * | 1995-05-30 | 2000-08-15 | Bude; Friedrich | Water lance blower with shortened water lance |
WO2001065179A1 (de) | 2000-03-01 | 2001-09-07 | Clyde Bergemann Gmbh | Kompakter wasserlanzenbläser |
US6691646B2 (en) | 2000-03-01 | 2004-02-17 | Clyde Bergemann Gmbh | Compact water lance blower |
EP1473515A2 (de) * | 2000-03-01 | 2004-11-03 | Clyde Bergemann GmbH | Kompakter Wasserlanzenbläser modularer Bauart |
EP1473515A3 (de) * | 2000-03-01 | 2004-11-17 | Clyde Bergemann GmbH | Kompakter Wasserlanzenbläser modularer Bauart |
WO2002021064A2 (de) | 2000-09-11 | 2002-03-14 | Clyde Bergemann Gmbh | Kugelgelenk-lagerung für eine wasserlanze eines wasserlanzenbläsers |
US6907847B2 (en) | 2000-09-11 | 2005-06-21 | Clyde Bergemann Gmbh | Ball-joint mounting for a water lance of a water lance blower |
DE102004010771B4 (de) * | 2004-03-05 | 2015-09-24 | Bilfinger Rosink Gmbh | Vorrichtung zum Bewegen eines Blasrohres |
WO2007062477A1 (en) * | 2005-11-30 | 2007-06-07 | Mack Innovations Pty Ltd | Water lance assembly |
AU2006319757B2 (en) * | 2005-11-30 | 2009-11-05 | Mack Innovations (Australia) Pty Ltd | Water lance assembly |
Also Published As
Publication number | Publication date |
---|---|
SI9200394B (sl) | 2002-02-28 |
AU3081192A (en) | 1993-07-19 |
SI9200394A (en) | 1993-06-30 |
DE59206325D1 (de) | 1996-06-20 |
ATE138190T1 (de) | 1996-06-15 |
HUT67888A (en) | 1995-05-29 |
JP3155553B2 (ja) | 2001-04-09 |
DE4239410C2 (de) | 1997-07-17 |
ES2089582T3 (es) | 1996-10-01 |
HRP921429B1 (en) | 1998-06-30 |
HRP921429A2 (en) | 1994-08-31 |
YU108092A (sh) | 1996-01-08 |
SK281985B6 (sk) | 2001-09-11 |
CN1076019A (zh) | 1993-09-08 |
DE4239410A1 (de) | 1994-05-19 |
HU217469B (hu) | 2000-02-28 |
EP0616680A1 (de) | 1994-09-28 |
HU9401827D0 (en) | 1994-09-28 |
RU2100736C1 (ru) | 1997-12-27 |
JPH07502105A (ja) | 1995-03-02 |
EP0616680B1 (de) | 1996-05-15 |
KR100265920B1 (ko) | 2000-09-15 |
US5503115A (en) | 1996-04-02 |
DK0616680T3 (da) | 1996-09-30 |
TR26991A (tr) | 1994-09-13 |
CA2126184A1 (en) | 1993-06-24 |
SK72894A3 (en) | 1995-02-08 |
CZ149794A3 (en) | 1995-01-18 |
CZ281762B6 (cs) | 1997-01-15 |
CN1053041C (zh) | 2000-05-31 |
YU48339B (sh) | 1998-05-15 |
AU672375B2 (en) | 1996-10-03 |
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