NO770026L - Fremgangsm}te og anordning til } fjerne fordampbare andeler fra h¦yvisk¦se l¦sninger eller smelter av termoplastiske kunststoffer. - Google Patents
Fremgangsm}te og anordning til } fjerne fordampbare andeler fra h¦yvisk¦se l¦sninger eller smelter av termoplastiske kunststoffer.Info
- Publication number
- NO770026L NO770026L NO770026A NO770026A NO770026L NO 770026 L NO770026 L NO 770026L NO 770026 A NO770026 A NO 770026A NO 770026 A NO770026 A NO 770026A NO 770026 L NO770026 L NO 770026L
- Authority
- NO
- Norway
- Prior art keywords
- melt
- product
- degassing
- temperature
- heat
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 49
- 229920001169 thermoplastic Polymers 0.000 title claims description 28
- 239000004416 thermosoftening plastic Substances 0.000 title claims description 5
- 238000002844 melting Methods 0.000 title description 3
- 230000008018 melting Effects 0.000 title description 3
- 238000007872 degassing Methods 0.000 claims description 77
- 229910052751 metal Inorganic materials 0.000 claims description 43
- 239000002184 metal Substances 0.000 claims description 43
- 238000001704 evaporation Methods 0.000 claims description 36
- 230000008020 evaporation Effects 0.000 claims description 36
- 239000004033 plastic Substances 0.000 claims description 28
- 229920003023 plastic Polymers 0.000 claims description 28
- 239000000155 melt Substances 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000012071 phase Substances 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000012808 vapor phase Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 68
- 239000000047 product Substances 0.000 description 58
- 229920000642 polymer Polymers 0.000 description 16
- 239000000203 mixture Substances 0.000 description 14
- 239000000178 monomer Substances 0.000 description 13
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 12
- 230000006378 damage Effects 0.000 description 10
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000002904 solvent Substances 0.000 description 6
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 229920002959 polymer blend Polymers 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920001897 terpolymer Polymers 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003685 thermal hair damage Effects 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920000638 styrene acrylonitrile Polymers 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/06—Treatment of polymer solutions
- C08F6/10—Removal of volatile materials, e.g. solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0021—Degasification of liquids by bringing the liquid in a thin layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F7/00—Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
- F28F7/02—Blocks traversed by passages for heat-exchange media
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S159/00—Concentrating evaporators
- Y10S159/10—Organic
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Extraction Or Liquid Replacement (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762606612 DE2606612A1 (de) | 1976-02-19 | 1976-02-19 | Verfahren und vorrichtung zur entfernung von verdampfbaren anteilen aus hochviskosen loesungen oder schmelzen thermoplastischer kunststoffe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO770026L true NO770026L (no) | 1977-08-22 |
Family
ID=5970272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO770026A NO770026L (no) | 1976-02-19 | 1977-01-05 | Fremgangsm}te og anordning til } fjerne fordampbare andeler fra h¦yvisk¦se l¦sninger eller smelter av termoplastiske kunststoffer. |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4153501A (sv) |
| BE (1) | BE851614A (sv) |
| DE (1) | DE2606612A1 (sv) |
| ES (1) | ES456038A1 (sv) |
| FR (1) | FR2341341A1 (sv) |
| GB (1) | GB1577967A (sv) |
| IT (1) | IT1078353B (sv) |
| NL (1) | NL7701586A (sv) |
| NO (1) | NO770026L (sv) |
| SE (1) | SE7701718L (sv) |
Families Citing this family (44)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5556103A (en) * | 1978-10-20 | 1980-04-24 | Hitachi Ltd | Removal of volatile substance from polymer |
| US4356116A (en) * | 1981-04-03 | 1982-10-26 | General Electric Company | Devolatilized room temperature vulcanizable silicone rubber composition |
| US4574876A (en) * | 1981-05-11 | 1986-03-11 | Extracorporeal Medical Specialties, Inc. | Container with tapered walls for heating or cooling fluids |
| US4501885A (en) * | 1981-10-14 | 1985-02-26 | Phillips Petroleum Company | Diluent and inert gas recovery from a polymerization process |
| US4640740A (en) * | 1982-06-04 | 1987-02-03 | Blaw Knox Corporation | Apparatus for evaporative stripping |
| US4511431A (en) * | 1982-06-04 | 1985-04-16 | White Consolidated Industries, Inc. | Process for evaporative stripping |
| US4420602A (en) * | 1982-09-27 | 1983-12-13 | The Upjohn Company | Melt-polymerization process for the preparation of thermoplastic polyamides and polyesteramides |
| US4420603A (en) * | 1982-09-27 | 1983-12-13 | The Upjohn Company | Continuous, solvent-free process for preparing thermoplastic polyamides and polyesteramides |
| US4728701A (en) * | 1983-09-19 | 1988-03-01 | Jarvis Marvin A | Process for the polymerization of acrylates |
| JPS61203103A (ja) * | 1985-03-05 | 1986-09-09 | Mitsui Eng & Shipbuild Co Ltd | 重合物中の揮発性物質除去装置における熱交換器 |
| CA1265289A (en) * | 1985-12-16 | 1990-01-30 | Viney Pal Aneja | Method and apparatus for devolatilizing polymer solutions |
| US4715433A (en) * | 1986-06-09 | 1987-12-29 | Air Products And Chemicals, Inc. | Reboiler-condenser with doubly-enhanced plates |
| US4715431A (en) * | 1986-06-09 | 1987-12-29 | Air Products And Chemicals, Inc. | Reboiler-condenser with boiling and condensing surfaces enhanced by extrusion |
| DE3628994A1 (de) * | 1986-08-26 | 1988-03-03 | Basf Ag | Kontinuierliches verfahren zur entfernung von geloesten stoffen aus polymerloesungen |
| US4865689A (en) * | 1988-01-27 | 1989-09-12 | Mobil Oil Corporation | Method and apparatus for evaporating the volatile components of a polymer |
| WO1990000243A1 (en) * | 1988-07-04 | 1990-01-11 | Japan Oxygen Co., Ltd. | Condenser/evaporator |
| IT1226303B (it) * | 1988-07-26 | 1990-12-27 | Montedipe Spa | Processo ed apparato per la devolatilizzazione di soluzioni di polimeri. |
| US5024728A (en) * | 1988-08-29 | 1991-06-18 | Dainippon Ink And Chemicals, Inc. | Devolatilization of liquid composition containing polymer and volatile constituents |
| US4934433A (en) * | 1988-11-15 | 1990-06-19 | Polysar Financial Services S.A. | Devolatilization |
| JPH02232205A (ja) * | 1989-03-06 | 1990-09-14 | Nippon Steel Chem Co Ltd | 揮発性物質の除去方法及びその装置 |
| US5118388A (en) * | 1990-04-12 | 1992-06-02 | Polysar Financial Services S.A. | Polymer melt distributor |
| US5037955A (en) * | 1990-06-07 | 1991-08-06 | The Dow Chemical Company | Method for heating a viscous polyethylene solution |
| US5453158A (en) * | 1994-03-10 | 1995-09-26 | The Dow Chemical Company | Polymer devolatilizer |
| DE19817677A1 (de) | 1998-04-21 | 1999-10-28 | Bayer Ag | Verfahren zur Entfernung flüchtiger Komponenten aus Polymerlösungen |
| JP3705003B2 (ja) | 1999-04-07 | 2005-10-12 | 三菱化学株式会社 | 重合体溶液の製造方法 |
| DE10008531A1 (de) * | 2000-02-24 | 2001-09-13 | List Ag Arisdorf | Verfahren zum Behandeln eines Produktes in zumindest einem Mischkneter |
| EP1268026B1 (en) * | 2000-03-21 | 2009-02-18 | Sulzer Chemtech AG | Polymer solution preheater and method for preheating such solutions |
| DE10042746A1 (de) * | 2000-08-31 | 2002-03-28 | Degussa | Verfahren und Vorrichtung zum Durchführen von Reaktionen in einem Reaktor mit spaltförmigen Reaktionsräumen |
| DE10333577A1 (de) * | 2003-07-24 | 2005-02-24 | Bayer Technology Services Gmbh | Verfahren und Vorrichtung zur Entfernung von flüchtigen Substanzen aus hochviskosen Medien |
| US8518212B2 (en) * | 2009-02-06 | 2013-08-27 | Dow Globarl Technologies LLC | Devolatilization apparatus and process |
| FR2982016A1 (fr) * | 2011-10-28 | 2013-05-03 | Tmw | Support d'etalement d'un liquide en ecoulement gravitaire, systeme d'etalement et colonne d'evaporation comprenant un tel support |
| US10611967B2 (en) | 2015-05-20 | 2020-04-07 | Saudi Arabian Oil Company | Pyrolysis to determine hydrocarbon expulsion efficiency of hydrocarbon source rock |
| US10371461B2 (en) * | 2016-10-11 | 2019-08-06 | International Business Machines Corporation | Multi-layered counterflow expanding microchannel cooling architecture and system thereof |
| CA3068267A1 (en) * | 2017-06-29 | 2019-01-03 | Saudi Arabian Oil Company | Pyrolysis to determine hydrocarbon expulsion efficiency of hydrocarbon source rock |
| SG11202011412UA (en) | 2018-05-31 | 2020-12-30 | Dow Global Technologies Llc | Method and system for polymer production |
| US12098233B2 (en) | 2018-05-31 | 2024-09-24 | Dow Global Technologies Llc | Devolatilizer design |
| CN112368537B (zh) | 2018-06-27 | 2022-10-04 | 株式会社威尔康 | 热传输装置和其制造方法 |
| US12061053B2 (en) | 2018-06-27 | 2024-08-13 | Welcon Inc. | Heat transport device and method for manufacturing same |
| CN109443043B (zh) * | 2018-09-05 | 2019-09-27 | 西安交通大学 | 一种铅-超临界二氧化碳中间换热器 |
| CN113834360B (zh) * | 2020-06-23 | 2024-06-18 | 青岛海尔空调器有限总公司 | 用于调节换热系统的方法及装置、换热系统 |
| EP4326806A1 (en) * | 2021-04-23 | 2024-02-28 | Aditya Birla Chemicals (Thailand) Limited | Process and system for recycling epoxy thermosets |
| US12044488B2 (en) * | 2021-10-01 | 2024-07-23 | Hamilton Sundstrand Corporation | Interlocking dovetail geometry joint |
| CN113996074B (zh) * | 2021-11-04 | 2023-05-09 | 洛阳市公路事业发展中心 | 一种赤泥提碱用碱液多级高效浓缩系统 |
| DE102023115797A1 (de) | 2022-06-29 | 2024-01-04 | Röhm Gmbh | Verbessertes Verfahren zur Herstellung eines Polymers |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE132577C (sv) * | 1901-04-25 | 1902-07-11 | ||
| US2853127A (en) * | 1955-03-29 | 1958-09-23 | Union Carbide Corp | Concentration of foamy latices |
| GB888716A (en) * | 1957-01-09 | 1962-02-07 | Dow Chemical Co | Process and apparatus for devolatilizing polymeric materials, especially alkenyl aromatic polymers |
| GB1046185A (en) * | 1963-09-27 | 1966-10-19 | Mobay Chemical Corp | Process for the recovery of polycarbonates from solutions thereof |
| US3385770A (en) * | 1964-09-17 | 1968-05-28 | Saline Water Conversion Corp | Apparatus for use in evaporative processes |
| AU419961B2 (en) * | 1968-11-19 | 1971-12-20 | Toyo Koatsu Industries, Incorporated | Process and apparatus for removing volatile substances from viscous compositions |
| GB1354502A (en) * | 1970-08-28 | 1974-06-05 | Ici Ltd | Heat exchangers |
| BE786885A (fr) * | 1971-07-30 | 1973-01-29 | Basf Ag | Procede d'elimination des constituants vaporisables de solutions polymeres |
| US3966538A (en) * | 1973-01-09 | 1976-06-29 | Monsanto Company | Falling strand devolatilization apparatus |
| US3853672A (en) * | 1973-01-09 | 1974-12-10 | Monsanto Co | Falling strand devolatilizer using one preheater with two flash chambers |
| NL165181C (nl) * | 1973-02-20 | 1981-03-16 | Toyo Engineering Corp | Werkwijze voor het continu verwijderen van vluchtige stoffen uit polymerisatieoplossingen. |
-
1976
- 1976-02-19 DE DE19762606612 patent/DE2606612A1/de not_active Withdrawn
-
1977
- 1977-01-05 NO NO770026A patent/NO770026L/no unknown
- 1977-01-21 IT IT19539/77A patent/IT1078353B/it active
- 1977-02-14 US US05/768,636 patent/US4153501A/en not_active Expired - Lifetime
- 1977-02-15 NL NL7701586A patent/NL7701586A/xx not_active Application Discontinuation
- 1977-02-16 SE SE7701718A patent/SE7701718L/sv unknown
- 1977-02-17 FR FR7704513A patent/FR2341341A1/fr active Pending
- 1977-02-18 GB GB6880/77A patent/GB1577967A/en not_active Expired
- 1977-02-18 BE BE175088A patent/BE851614A/xx not_active IP Right Cessation
- 1977-02-18 ES ES456038A patent/ES456038A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE7701718L (sv) | 1977-08-20 |
| US4153501A (en) | 1979-05-08 |
| BE851614A (fr) | 1977-08-18 |
| GB1577967A (en) | 1980-10-29 |
| IT1078353B (it) | 1985-05-08 |
| FR2341341A1 (fr) | 1977-09-16 |
| NL7701586A (nl) | 1977-08-23 |
| DE2606612A1 (de) | 1977-08-25 |
| ES456038A1 (es) | 1978-02-16 |
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