ES2048312T3 - Procedimiento y dispositivo de regulacion de un caudal de co2 liquido, y aplicacion a un tunel de refrigeracion. - Google Patents

Procedimiento y dispositivo de regulacion de un caudal de co2 liquido, y aplicacion a un tunel de refrigeracion.

Info

Publication number
ES2048312T3
ES2048312T3 ES89403619T ES89403619T ES2048312T3 ES 2048312 T3 ES2048312 T3 ES 2048312T3 ES 89403619 T ES89403619 T ES 89403619T ES 89403619 T ES89403619 T ES 89403619T ES 2048312 T3 ES2048312 T3 ES 2048312T3
Authority
ES
Spain
Prior art keywords
application
regulation
procedure
liquid
flow
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.)
Expired - Lifetime
Application number
ES89403619T
Other languages
English (en)
Other versions
ES2048312T5 (es
Inventor
Patrick Micheau
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9373521&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ES2048312(T3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of ES2048312T3 publication Critical patent/ES2048312T3/es
Application granted granted Critical
Publication of ES2048312T5 publication Critical patent/ES2048312T5/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/451—Mixing liquids with liquids; Emulsifying using flow mixing by injecting one liquid into another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/49—Mixing systems, i.e. flow charts or diagrams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/10—Arrangements for preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
    • B01F23/23762—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/48—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids
    • B01F23/481—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids using liquefied or cryogenic gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0338—Pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0114—Propulsion of the fluid with vacuum injectors, e.g. venturi
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0636—Flow or movement of content
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/024—Improving metering

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Accessories For Mixers (AREA)

Abstract

SIGUIENDO ESTE PROCEDIMIENTO, SE MANTIENE EN EL CONDUCTO (3), COMO PROTECCION DE LA VALVULA (5), HASTA LA PROXIMIDAD DEL PUNTO (A) DE INYECCION DEL CO2, UNA PRESION INTERMEDIA (PI) SUPERIOR A LA PRESION (PT) DEL PUNTO TRIPLE DEL CO2. APLICACION AL TRATAMIENTO DE AGUAS RESIDUALES O A LA CONGELACION ALIMENTICEA.
ES89403619T 1988-12-28 1989-12-22 Procedimiento y dispositivo de regulacion de un caudal de co2 liquido, y aplicacion a un tunel de refrigeracion. Expired - Lifetime ES2048312T5 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8817305A FR2641854B1 (fr) 1988-12-28 1988-12-28 Procede et dispositif de regulation d'un debit de co2 liquide, et application a un tunnel de refroidissement

Publications (2)

Publication Number Publication Date
ES2048312T3 true ES2048312T3 (es) 1994-03-16
ES2048312T5 ES2048312T5 (es) 2001-05-16

Family

ID=9373521

Family Applications (1)

Application Number Title Priority Date Filing Date
ES89403619T Expired - Lifetime ES2048312T5 (es) 1988-12-28 1989-12-22 Procedimiento y dispositivo de regulacion de un caudal de co2 liquido, y aplicacion a un tunel de refrigeracion.

Country Status (8)

Country Link
US (1) US5040374A (es)
EP (1) EP0376823B2 (es)
AT (1) ATE100921T1 (es)
AU (1) AU629584B2 (es)
CA (1) CA2006789C (es)
DE (1) DE68912755T3 (es)
ES (1) ES2048312T5 (es)
FR (1) FR2641854B1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014147281A1 (es) 2013-03-20 2014-09-25 Icaleos, S.L Sistema autónomo portátil auto-refrigerante

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5285644A (en) * 1992-11-27 1994-02-15 Thermo King Corporation Air conditioning and refrigeration apparatus utilizing a cryogen
US5267446A (en) * 1992-11-27 1993-12-07 Thermo King Corp. Air conditioning and refrigeration systems utilizing a cryogen
US5267443A (en) * 1992-11-27 1993-12-07 Thermo King Corporation Air conditioning and refrigeration methods and apparatus utilizing a cryogen
US5320167A (en) * 1992-11-27 1994-06-14 Thermo King Corporation Air conditioning and refrigeration systems utilizing a cryogen and heat pipes
US5259198A (en) * 1992-11-27 1993-11-09 Thermo King Corporation Air conditioning and refrigeration systems utilizing a cryogen
US5311927A (en) * 1992-11-27 1994-05-17 Thermo King Corporation Air conditioning and refrigeration apparatus utilizing a cryogen
US5315840A (en) * 1992-11-27 1994-05-31 Thermo King Corporation Air conditioning and refrigeration methods and apparatus utilizing a cryogen
US5305825A (en) * 1992-11-27 1994-04-26 Thermo King Corporation Air conditioning and refrigeration apparatus utilizing a cryogen
US5287705A (en) * 1993-02-16 1994-02-22 Thermo King Corporation Air conditioning and refrigeration systems utilizing a cryogen
US5363658A (en) * 1993-07-09 1994-11-15 The Boc Group, Inc. Apparatus and process for chilling food products
US5365744A (en) * 1993-11-08 1994-11-22 Thermo King Corporation Air conditioning and refrigeration systems utilizing a cryogen
FR2734624B1 (fr) * 1995-05-24 1997-07-04 Carboxyque Francaise Dispositif d'injection de liquide sous pression dans une enceinte
DE19621835A1 (de) * 1996-05-31 1997-12-04 Aga Ab Expansionsdüse und Verfahren zur Erzeugung von Kohlendioxidschnee
US5813237A (en) * 1997-06-27 1998-09-29 The Boc Group, Inc. Cryogenic apparatus and method for spraying a cryogen incorporating generation of two phase flow
US5868003A (en) * 1997-07-14 1999-02-09 Praxair Technology, Inc. Apparatus for producing fine snow particles from a flow liquid carbon dioxide
US5916246A (en) * 1997-10-23 1999-06-29 Thermo King Corporation System and method for transferring liquid carbon dioxide from a high pressure storage tank to a lower pressure transportable tank
FR2787862B1 (fr) * 1998-12-29 2001-01-26 Carboxyque Francaise Procede et dispositif d'injection regulee de dioxyde de carbone liquide dans un liquide sous pression
US6751966B2 (en) * 2001-05-25 2004-06-22 Thermo King Corporation Hybrid temperature control system
US6609382B2 (en) * 2001-06-04 2003-08-26 Thermo King Corporation Control method for a self-powered cryogen based refrigeration system
US6698212B2 (en) * 2001-07-03 2004-03-02 Thermo King Corporation Cryogenic temperature control apparatus and method
US6631621B2 (en) * 2001-07-03 2003-10-14 Thermo King Corporation Cryogenic temperature control apparatus and method
US6694765B1 (en) * 2002-07-30 2004-02-24 Thermo King Corporation Method and apparatus for moving air through a heat exchanger
US6895764B2 (en) * 2003-05-02 2005-05-24 Thermo King Corporation Environmentally friendly method and apparatus for cooling a temperature controlled space
FR2903482B1 (fr) 2006-07-10 2008-08-22 L'air Liquide Systeme d'injection de fluide cryogenique permettant le traitement de produits en vrac
DE102008052802A1 (de) 2008-10-22 2010-04-29 Messer France S.A.S Anordnung zum Eintragen von flüssigem Kohlendioxid in ein Medium
US10512278B2 (en) 2015-04-24 2019-12-24 Messer Industries Usa, Inc. Inline mixing injector for liquid products
US20170038117A1 (en) * 2015-08-03 2017-02-09 Michael D. Newman Pulsed liquid-gas entrained cryogen flow generator
WO2021121652A1 (de) 2019-12-18 2021-06-24 Linde Gmbh Verfahren und anordnung zur einbringung von gas in ein medium
CN111254858B (zh) * 2020-03-06 2021-09-21 西南交通大学 一种液态二氧化碳清洗机和清洗方法

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GB351839A (es) * 1929-09-23 1931-07-02 Hugo Mestern
GB807088A (en) * 1954-06-09 1959-01-07 Pyrene Co Ltd Improvements in valves for controlling the discharge of gas stored in the liquid state
US3109296A (en) * 1961-09-29 1963-11-05 Chemetron Corp Apparatus and method for refrigeration by carbon dioxide
US3214928A (en) * 1963-03-22 1965-11-02 Oberdorfer Karl Method and apparatus for freezing food products
US3661483A (en) * 1969-08-08 1972-05-09 Robert N Bose Apparatus for controlling the flow of liquid
US3708995A (en) * 1971-03-08 1973-01-09 D Berg Carbon dioxide food freezing method and apparatus
FR2142309A5 (en) * 1971-06-18 1973-01-26 Mille Gaston Cryogenic liq spray - of carbon dioxide eliminates snow formation
FR2368665A1 (fr) * 1976-10-25 1978-05-19 Carboxyque Francaise Appareillage de fourniture de dioxyde de carbone ou d'hemioxyde d'azote liquides sous pression

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014147281A1 (es) 2013-03-20 2014-09-25 Icaleos, S.L Sistema autónomo portátil auto-refrigerante

Also Published As

Publication number Publication date
DE68912755D1 (de) 1994-03-10
DE68912755T3 (de) 2001-08-02
CA2006789C (fr) 1994-10-25
ATE100921T1 (de) 1994-02-15
EP0376823B2 (fr) 2001-04-11
CA2006789A1 (fr) 1990-06-28
EP0376823A1 (fr) 1990-07-04
EP0376823B1 (fr) 1994-01-26
AU629584B2 (en) 1992-10-08
US5040374A (en) 1991-08-20
DE68912755T2 (de) 1994-05-11
FR2641854B1 (fr) 1994-01-14
FR2641854A1 (fr) 1990-07-20
AU4732889A (en) 1990-07-05
ES2048312T5 (es) 2001-05-16

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