EP0149843B1 - Verfahren und Vorrichtung zum Dosieren kleiner Mengen eines tiefsiedenden, verflüssigten Gases - Google Patents

Verfahren und Vorrichtung zum Dosieren kleiner Mengen eines tiefsiedenden, verflüssigten Gases Download PDF

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Publication number
EP0149843B1
EP0149843B1 EP19840116275 EP84116275A EP0149843B1 EP 0149843 B1 EP0149843 B1 EP 0149843B1 EP 19840116275 EP19840116275 EP 19840116275 EP 84116275 A EP84116275 A EP 84116275A EP 0149843 B1 EP0149843 B1 EP 0149843B1
Authority
EP
European Patent Office
Prior art keywords
outlet opening
gas
liquid
tank
pressure
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
Application number
EP19840116275
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0149843A2 (de
EP0149843A3 (en
Inventor
Guido Büschkens
Peter Nobis
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT84116275T priority Critical patent/ATE39561T1/de
Publication of EP0149843A2 publication Critical patent/EP0149843A2/de
Publication of EP0149843A3 publication Critical patent/EP0149843A3/de
Application granted granted Critical
Publication of EP0149843B1 publication Critical patent/EP0149843B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/006—Adding fluids for preventing deformation of filled and closed containers or wrappers
    • 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • 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
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2227/04—Methods for emptying or filling
    • 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
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0408—Level of content in the vessel
    • F17C2250/0413—Level of content in the vessel with floats
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0391—Affecting flow by the addition of material or energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]

Definitions

  • the invention relates to a method for shutting off and / or dosing a liquid according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 6.
  • FR-A-1497036 describes a decanting process with which the possibility of decanting very large quantities of liquid in a very short time is to be made possible with simple operation.
  • a gas cushion under increased pressure is built up under a cap, which covers a transfer line, with which the line opening is closed (diving bell principle). The pressure of the gas pumped under the cap increases depending on the level of the liquid.
  • This gas cushion generated under the cap only has to be set up once and then blocks the flow of the liquid through the transfer line without further supply of a compressed gas.
  • This gas cushion can only block the transfer line against the flow of the liquid of the container if the line opening is covered with the cap in the direction of flow of the liquid or if the upper section of the transfer line is rotated by 180 °.
  • the invention has for its object to enable a trouble-free shut-off and / or metering a low-boiling, liquefied gas in a simple manner.
  • an interruption in the supply of the sealing gas should lead to an immediate exit of the liquefied gas from the outlet opening.
  • the advantages achieved by the invention are, in particular, that trouble-free starting and stopping of a partially boiling, liquefied gas jet emerging from an outlet opening is ensured in the simplest manner.
  • the outlet opening and the chamber in particular, but possibly also the entire system (container, line) can be flushed with dry gas.
  • the device shown in Fig. 1 consists of a sintered metal body 1, which is located at the end of the line 2, which serves to supply the liquefied gas.
  • the sintered metal body 1 is arranged in a container 3 which, in a container wall 14, contains an outlet opening 4 for liquefied gas arranged at a distance 21 within the container 3 and in its upper part a plurality of discharge openings 5 for evaporated gas.
  • the outlet opening 4 is arranged in a preferably cylindrical body 22 which has a thread 24 on its circumference 23. With the external thread 24, the body 22 is screwed into a pipe socket 26 provided with an internal thread 25, the length 27 of which protrudes into the container 3 is greater than the width 28 of the body 22.
  • the pipe socket 26 is arranged with the end face 30 facing the outlet side 29 of the outlet opening 4 in an opening of the container wall 14 corresponding to its outer diameter 31 and welded to the container wall 14.
  • a cup-shaped, porous sintered metal body 13 is installed on a disk 33 which is fixedly connected to the stub connector 26 and which forms a chamber 15 separated from the container 3 with the disk 33 forming the bottom.
  • a line 16 is connected to the chamber 15 and is blocked by means of a solenoid valve 17.
  • the container 3 is in turn surrounded by a second container 6 provided with insulation. Between Intermediate space 8 is formed between containers 3 and 6.
  • the container 6 and the insulation 7 have a gas outlet opening 9 which is arranged below the outlet opening 4 for liquefied gas in the container 3.
  • the operation of the device according to the invention is as follows:
  • the pressurized and mixed with gas liquefied gas, for example nitrogen, passes through line 2 into sintered metal body 1, the cross section of which is larger than that of the feed line.
  • the sintered metal body 1 is permeable to gaseous and liquefied gas.
  • the relaxed, now at atmospheric pressure and boiling at -196 ° Celsius liquid nitrogen 10 collects at the bottom of the container 3.
  • the likewise -196 ° Celsius cold gaseous nitrogen passes through the discharge openings 5 into the space 8 between the containers 3 and 6 a.
  • the gas flow is indicated by arrows 11.
  • the cold gas now flows slowly to the large outlet opening 9 and cools the entire device so deeply that as little heat as possible is supplied from the outside to the liquid nitrogen in the container 3.
  • the jet of liquid nitrogen emerging through the outlet opening 4 is not disturbed by the gas flow. Since the outlet opening 4 consists of an exchangeable body 22, the strength of the emerging liquid jet can be changed as needed per unit of time. In addition to the cross section of the outlet opening 4, the continuously exiting quantity of volatile nitrogen per unit of time is also determined by the level of the liquid nitrogen 10. The liquid level is therefore kept constant by means of a height-adjustable measuring probe 12, which opens or closes a solenoid valve, which is arranged in line 2 and is not shown, as required. The metered liquid jet continuously emerging through the outlet opening 4 is reliably blocked by the continuous supply of a sealing gas into the chamber 15.
  • the outlet opening 4 is flushed with liquid nitrogen 10 over the entire width 28, so that the outlet opening 4 is cooled during the entire period of the blocking of the liquid jet .
  • cooling of the device is achieved by the rising of the sealing gas bubbling through the liquid nitrogen 10 into the intermediate space 8 even during the blocking of the liquid jet.
  • a shut-off pressure of in particular 0.1 to 0.4 bar above the pressure of the liquid nitrogen with the lowest gas consumption, a sufficient sealing pressure is achieved which frees the chamber 15 from the liquid and keeps the outlet opening 4 dry without mixing of the dry sealing gas comes with the liquid.
  • the low shut-off pressure is achieved by the arrangement of the sintered metal body 13 in front of the outlet opening 4, whereby on the one hand the hydrostatic pressure of the liquid nitrogen 10 on the chamber 15 is reduced and on the other hand additional foreign particles, such as metal chips, are kept away from the outlet opening 4.
  • the sealing gas which is conveyed into the chamber 15 with a preferably small chamber volume of approximately 10 cm 3 with this pressure, escapes on the one hand through the outlet opening 4 with a diameter of approximately 2 mm in this chamber volume and on the other hand through the irregularly shaped openings 34 of the sintered metal body 13 If the gas supply is interrupted via the solenoid valve 17 arranged in the line 16, liquid nitrogen immediately emerges again at the outlet opening 4 without a measurable time difference between the interruption of the gas supply and the exit of the liquid jet being ascertainable.
  • other cold-resistant filters such as sieves, can also be used.
  • the total openings 34 of the sintered metal body 13 must be larger than the outlet opening 4 in order to avoid delays in the liquid throughput through the outlet openings 4.
  • cryogenic boiling gases of the metering device as sealing or drying gases has proven to be particularly advantageous.
  • other dry sealing gases whose boiling temperature is below that of the liquid gases, such as, for. B. helium gas for N 2- liquid or N 2 gas for argon liquid to use.
  • FIG. 2 shows a further embodiment of the shut-off device according to the invention, a vertical arrangement of the chamber 15 being shown in FIG. 2a and a horizontal arrangement of the chamber 15 being schematically shown in FIG. 2b.
  • the chamber 15 is in this case formed by an antechamber 18 of the container 3 which is formed in front of the container wall 14 and whose passage opening 20 for the liquid nitrogen is closed with a plate-shaped sintered metal body 13.
  • the outlet opening 4, which is particularly simple and inexpensive to produce by the method according to the invention, is arranged in the antechamber 18.
  • the line 16 opens into the chamber 15 for supplying the sealing gas, which can be connected to the chamber 15 in a horizontal or vertical position (dashed line).
  • FIG. 3a schematically shows a tubular container 3 arranged in a horizontal position, in whose end-side container wall 14 the outlet opening 4 is arranged.
  • the chamber 15 of the tubular container 3 is created by installing a plate-shaped sintered metal body 13 in front of the outlet opening 4.
  • the line 16 for supplying the sealing gas is connected to the chamber 15.
  • the shut-off device works without a sintered metal body 13.
  • the chamber 15 is hereby formed by the gas bubble obtained within the tubular container 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Measuring Volume Flow (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Medicinal Preparation (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Vacuum Packaging (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • External Artificial Organs (AREA)
  • Cookers (AREA)
EP19840116275 1984-01-24 1984-12-24 Verfahren und Vorrichtung zum Dosieren kleiner Mengen eines tiefsiedenden, verflüssigten Gases Expired EP0149843B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84116275T ATE39561T1 (de) 1984-01-24 1984-12-24 Verfahren und vorrichtung zum dosieren kleiner mengen eines tiefsiedenden, verfluessigten gases.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3402292A DE3402292C2 (de) 1984-01-24 1984-01-24 Verfahren und Vorrichtung zum Dosieren kleiner Mengen eines tiefsiedenden, verflüssigten Gases
DE3402292 1984-01-24

Publications (3)

Publication Number Publication Date
EP0149843A2 EP0149843A2 (de) 1985-07-31
EP0149843A3 EP0149843A3 (en) 1986-05-14
EP0149843B1 true EP0149843B1 (de) 1988-12-28

Family

ID=6225735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840116275 Expired EP0149843B1 (de) 1984-01-24 1984-12-24 Verfahren und Vorrichtung zum Dosieren kleiner Mengen eines tiefsiedenden, verflüssigten Gases

Country Status (13)

Country Link
US (1) US4586343A (no)
EP (1) EP0149843B1 (no)
JP (1) JPS60168996A (no)
AT (1) ATE39561T1 (no)
AU (1) AU571156B2 (no)
CA (1) CA1258837A (no)
DE (1) DE3402292C2 (no)
DK (1) DK160641C (no)
ES (2) ES8609658A1 (no)
FI (1) FI77926C (no)
NO (1) NO161343C (no)
NZ (1) NZ210879A (no)
ZA (1) ZA85531B (no)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3642199A1 (de) * 1986-12-10 1988-06-30 Linde Ag Vorrichtung zum dosieren von tiefsiedenden verfluessigten gasen
US4956975A (en) * 1989-08-17 1990-09-18 Gustafson Keith W Shutoff valve for cryogenic liquid storage tank
US5271232A (en) * 1990-07-20 1993-12-21 Toshiba Ceramics Co., Ltd. Filtration apparatus
FR2688469A1 (fr) * 1992-03-16 1993-09-17 Air Liquide Dispositif d'injection sequencee d'une dose de liquide cryogenique.
US5272881A (en) * 1992-08-27 1993-12-28 The Boc Group, Inc. Liquid cryogen dispensing apparatus and method
GB9309637D0 (en) * 1993-05-11 1993-06-23 Boc Group Plc Cryogenic liquid dispensers
US5385025A (en) * 1994-03-04 1995-01-31 Mg Industries Apparatus and method for dispensing droplets of a cryogenic liquid
US5495717A (en) * 1994-05-04 1996-03-05 Messer Griesheim Gmbh Insulated container for storing liquid helium
GB9419055D0 (en) * 1994-09-21 1994-11-09 Boc Group Plc Liquid dispenser flow calming
DE102005044534B3 (de) 2005-09-17 2007-06-06 Astrium Gmbh Treibstofftank für kryogene Flüssigkeiten

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436411A (en) * 1945-12-11 1948-02-24 John A Weaver Portable liquid oxygen unit
US2834366A (en) * 1957-01-11 1958-05-13 Houdry Process Corp Valve for gas flow
US3270756A (en) * 1963-04-09 1966-09-06 Hugh L Dryden Fluid flow control valve
US3481205A (en) * 1966-10-17 1969-12-02 Singer General Precision Flueric valve element
FR1497036A (fr) * 1966-10-19 1967-10-06 Alfa Laval Ab Dispositif d'arrêt du débit d'un liquide soutiré d'un réservoir situé à un certain niveau pour être amené dans un réservoir à un niveau inférieur
US3605424A (en) * 1970-03-19 1971-09-20 Nasa Valving device for automatic refilling in cryogenic liquid systems
US3631870A (en) * 1970-04-14 1972-01-04 Factory Mutual Res Corp Method of stopping flow in a pipeline
US3933003A (en) * 1974-04-25 1976-01-20 General Dynamics Corporation Cryostat control
US4080802A (en) * 1976-07-14 1978-03-28 International Telephone And Telegraph Corporation Hybrid gas cryogenic cooler
DE2732318C2 (de) * 1977-07-16 1986-06-26 Messer Griesheim Gmbh, 6000 Frankfurt Vorrichtung zum Dosieren kleiner Mengen eines tiefsiedenden verflüssigten Gases
AU6832981A (en) * 1980-03-14 1981-09-17 Pharaoh, P.L.G. Metering sterilising agent into water
JPS5924932B2 (ja) * 1980-12-03 1984-06-13 東洋製罐株式会社 液化不活性ガス滴下充填装置
DE8107795U1 (de) * 1981-03-18 1983-05-19 Messer Griesheim Gmbh, 6000 Frankfurt "vorrichtung zur handhabung und dosierung kleiner mengen tiefkalten fluessigen mediums"

Also Published As

Publication number Publication date
NO845221L (no) 1985-07-25
ZA85531B (en) 1985-08-28
ES8801556A1 (es) 1988-02-16
JPH0559319B2 (no) 1993-08-30
FI850269A0 (fi) 1985-01-21
FI77926B (fi) 1989-01-31
DK160641C (da) 1991-09-02
CA1258837A (en) 1989-08-29
ES8609658A1 (es) 1986-09-01
EP0149843A2 (de) 1985-07-31
DE3402292C2 (de) 1986-01-23
US4586343A (en) 1986-05-06
AU571156B2 (en) 1988-03-31
AU3802685A (en) 1985-08-01
FI77926C (fi) 1989-05-10
NZ210879A (en) 1986-09-10
ES554852A0 (es) 1988-02-16
DK160641B (da) 1991-04-02
NO161343B (no) 1989-04-24
JPS60168996A (ja) 1985-09-02
DE3402292A1 (de) 1985-08-01
ES539609A0 (es) 1986-09-01
FI850269L (fi) 1985-07-25
ATE39561T1 (de) 1989-01-15
DK29585D0 (da) 1985-01-23
NO161343C (no) 1989-08-02
EP0149843A3 (en) 1986-05-14
DK29585A (da) 1985-07-25

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