DE2535937C2 - Verfahren zum Läutern von Glas sowie Vorrichtung zur Durchführung des Verfahrens - Google Patents
Verfahren zum Läutern von Glas sowie Vorrichtung zur Durchführung des VerfahrensInfo
- Publication number
- DE2535937C2 DE2535937C2 DE2535937A DE2535937A DE2535937C2 DE 2535937 C2 DE2535937 C2 DE 2535937C2 DE 2535937 A DE2535937 A DE 2535937A DE 2535937 A DE2535937 A DE 2535937A DE 2535937 C2 DE2535937 C2 DE 2535937C2
- Authority
- DE
- Germany
- Prior art keywords
- glass
- temperature
- channel
- mass
- refining
- 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
Links
- 239000011521 glass Substances 0.000 title claims description 63
- 238000000034 method Methods 0.000 title claims description 16
- 238000007670 refining Methods 0.000 title claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000006260 foam Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- 238000005187 foaming Methods 0.000 description 9
- 238000007654 immersion Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 5
- 230000009189 diving Effects 0.000 description 4
- 239000000156 glass melt Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 244000052616 bacterial pathogen Species 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000006063 cullet Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010433 feldspar Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 231100000681 Certain safety factor Toxicity 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Inorganic materials O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 1
- GOLCXWYRSKYTSP-UHFFFAOYSA-N arsenic trioxide Inorganic materials O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003258 bubble free glass Substances 0.000 description 1
- 241001233037 catfish Species 0.000 description 1
- 229910021540 colemanite Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- JAONJTDQXUSBGG-UHFFFAOYSA-N dialuminum;dizinc;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Al+3].[Zn+2].[Zn+2] JAONJTDQXUSBGG-UHFFFAOYSA-N 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004900 laundering Methods 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- HNINGCTVWLIKQX-UHFFFAOYSA-K potassium barium(2+) hydrogen carbonate carbonate Chemical compound C([O-])([O-])=O.[K+].C([O-])(O)=O.[Ba+2] HNINGCTVWLIKQX-UHFFFAOYSA-K 0.000 description 1
- KWPRMONEGGYFHN-UHFFFAOYSA-M potassium;sodium;chloride;nitrate Chemical compound [Na+].[K]Cl.[O-][N+]([O-])=O KWPRMONEGGYFHN-UHFFFAOYSA-M 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/14—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in revolving cylindrical furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B3/00—Charging the melting furnaces
- C03B3/02—Charging the melting furnaces combined with preheating, premelting or pretreating the glass-making ingredients, pellets or cullet
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B3/00—Charging the melting furnaces
- C03B3/02—Charging the melting furnaces combined with preheating, premelting or pretreating the glass-making ingredients, pellets or cullet
- C03B3/023—Preheating
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/12—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/173—Apparatus for changing the composition of the molten glass in glass furnaces, e.g. for colouring the molten glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/225—Refining
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
- C03B5/2353—Heating the glass by combustion with pure oxygen or oxygen-enriched air, e.g. using oxy-fuel burners or oxygen lances
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/004—Refining agents
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Glass Melting And Manufacturing (AREA)
- Glass Compositions (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7428188A FR2281902A1 (fr) | 1974-08-14 | 1974-08-14 | Perfectionnement a la fabrication du verre |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2535937A1 DE2535937A1 (de) | 1976-02-26 |
| DE2535937C2 true DE2535937C2 (de) | 1985-05-09 |
Family
ID=9142396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2535937A Expired DE2535937C2 (de) | 1974-08-14 | 1975-08-12 | Verfahren zum Läutern von Glas sowie Vorrichtung zur Durchführung des Verfahrens |
Country Status (15)
Families Citing this family (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4113459A (en) | 1974-08-14 | 1978-09-12 | Saint-Gobain Industries | Method and apparatus for melting mineral materials |
| US4110098A (en) | 1974-08-14 | 1978-08-29 | Saint-Gobain Industries | Molten glass refining apparatus |
| DE2703223B2 (de) * | 1977-01-27 | 1981-02-05 | Sorg - Gmbh & Co Kg, 8770 Lohr | Glasschmelzofen |
| JPS5526660U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1978-08-09 | 1980-02-21 | ||
| EP0015794B1 (fr) * | 1979-02-22 | 1984-05-30 | Rhone-Poulenc Chimie De Base | Procédé d'obtention d'une composition verrière à base de silicates métalliques présentant un bas point de fusion et des caractéristiques d'affinage améliorées |
| FR2530611A1 (fr) * | 1982-07-26 | 1984-01-27 | Saint Gobain Rech | Procede et dispositif de fusion de matieres minerales, notamment vitrifiables |
| FR2551746B1 (fr) * | 1983-09-14 | 1986-09-05 | Saint Gobain Vitrage | Procede et dispositif pour elaboration de verre fondu, et applications de ce dispositif |
| DE3375905D1 (en) * | 1983-10-14 | 1988-04-14 | Saint Gobain Isover | Method and apparatus for melting glassy mineral materials |
| US4596171A (en) * | 1983-10-19 | 1986-06-24 | Gerber Garment Technology, Inc. | Method and apparatus for ultrasonically cutting sheet material |
| EP0176898B1 (en) * | 1984-10-01 | 1988-11-30 | Ppg Industries, Inc. | Method and apparatus for inductively heating molten glass or the like |
| JPS61211436A (ja) * | 1985-03-14 | 1986-09-19 | 鹿島建設株式会社 | 合成ジヨイストスラブ |
| DE3780908T2 (de) * | 1986-10-02 | 1993-07-01 | Ppg Industries Inc | Verfahren und vorrichtung zum raffinieren von glas oder aehnlichem in mehreren stufen. |
| FR2774085B3 (fr) | 1998-01-26 | 2000-02-25 | Saint Gobain Vitrage | Procede de fusion et d'affinage de matieres vitrifiables |
| FR2815341B1 (fr) * | 2000-10-18 | 2003-08-29 | Clariant France Sa | Compositions pour la fabrication du verre a quantite reduite de carbonates ainsi que de systeme affinant et procede de preparation de composes verriers |
| JP4425536B2 (ja) * | 2001-10-30 | 2010-03-03 | 株式会社吉野工業所 | 容器とその熱成形装置および熱成形方法 |
| DE10348072B4 (de) * | 2003-10-13 | 2006-01-05 | Schott Ag | Vorrichtung zum Läutern einer Glasschmelze |
| US9021838B2 (en) | 2010-06-17 | 2015-05-05 | Johns Manville | Systems and methods for glass manufacturing |
| US9032760B2 (en) | 2012-07-03 | 2015-05-19 | Johns Manville | Process of using a submerged combustion melter to produce hollow glass fiber or solid glass fiber having entrained bubbles, and burners and systems to make such fibers |
| US8997525B2 (en) | 2010-06-17 | 2015-04-07 | Johns Manville | Systems and methods for making foamed glass using submerged combustion |
| US8707740B2 (en) | 2011-10-07 | 2014-04-29 | Johns Manville | Submerged combustion glass manufacturing systems and methods |
| US9096452B2 (en) * | 2010-06-17 | 2015-08-04 | Johns Manville | Methods and systems for destabilizing foam in equipment downstream of a submerged combustion melter |
| US9533905B2 (en) | 2012-10-03 | 2017-01-03 | Johns Manville | Submerged combustion melters having an extended treatment zone and methods of producing molten glass |
| FR2991759B1 (fr) * | 2012-06-12 | 2014-06-20 | Saint Gobain Isover | Installation de fusion de verre |
| WO2014055199A1 (en) | 2012-10-03 | 2014-04-10 | Johns Manville | Methods and systems for destabilizing foam in equipment downstream of a submerged combustion melter |
| US9815726B2 (en) | 2015-09-03 | 2017-11-14 | Johns Manville | Apparatus, systems, and methods for pre-heating feedstock to a melter using melter exhaust |
| CN105776819B (zh) * | 2016-04-27 | 2018-07-31 | 巨石集团有限公司 | 一种具有高熔化率的玻璃池窑 |
| US10246362B2 (en) | 2016-06-22 | 2019-04-02 | Johns Manville | Effective discharge of exhaust from submerged combustion melters and methods |
| US10301208B2 (en) | 2016-08-25 | 2019-05-28 | Johns Manville | Continuous flow submerged combustion melter cooling wall panels, submerged combustion melters, and methods of using same |
| US10196294B2 (en) | 2016-09-07 | 2019-02-05 | Johns Manville | Submerged combustion melters, wall structures or panels of same, and methods of using same |
| US10233105B2 (en) | 2016-10-14 | 2019-03-19 | Johns Manville | Submerged combustion melters and methods of feeding particulate material into such melters |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB624002A (en) * | 1946-07-23 | 1949-05-26 | Juan Finger | Improvements relating to electric furnaces for the manufacture of glass or the like |
| US2523030A (en) * | 1948-10-30 | 1950-09-19 | Glass Fibers Inc | Electric glass furnace |
| US2593197A (en) * | 1949-09-29 | 1952-04-15 | Owens Illinois Glass Co | Inclined melter furnace and method of melting glass |
| DE1017340B (de) * | 1953-06-11 | 1957-10-10 | Jenaer Glaswerk Schott & Gen | Verfahren zum Laeutern von Glas |
| NL114021C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1959-03-28 | 1900-01-01 | ||
| US3337324A (en) * | 1963-04-30 | 1967-08-22 | Union Carbide Corp | Process for melting and refining glass batch |
| FR2135028B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1971-04-01 | 1974-09-06 | Boussois Souchon Neuvesel Sa | |
| JPS4859120A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1971-11-26 | 1973-08-18 | ||
| JPS529197B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1972-05-25 | 1977-03-14 | ||
| US3811860A (en) * | 1972-06-09 | 1974-05-21 | Ppg Industries Inc | Processing of stirring molten glass with bubbles from electrolysis |
| US3819350A (en) * | 1972-09-28 | 1974-06-25 | Owens Illinois Inc | Method for rapidly melting and refining glass |
-
1974
- 1974-08-14 FR FR7428188A patent/FR2281902A1/fr active Granted
-
1975
- 1975-08-11 CA CA233,203A patent/CA1073213A/en not_active Expired
- 1975-08-11 GB GB33381/75A patent/GB1514317A/en not_active Expired
- 1975-08-12 DE DE2535937A patent/DE2535937C2/de not_active Expired
- 1975-08-13 DK DK368075A patent/DK368075A/da not_active Application Discontinuation
- 1975-08-13 CH CH1054875A patent/CH595291A5/xx not_active IP Right Cessation
- 1975-08-13 NO NO752828A patent/NO141749C/no unknown
- 1975-08-13 LU LU73202A patent/LU73202A1/xx unknown
- 1975-08-13 AT AT0629475A patent/AT366014B/de not_active IP Right Cessation
- 1975-08-13 BE BE159184A patent/BE832408A/xx not_active IP Right Cessation
- 1975-08-13 SE SE7509072A patent/SE413397B/xx unknown
- 1975-08-13 NL NLAANVRAGE7509629,A patent/NL177682C/xx not_active IP Right Cessation
- 1975-08-13 IT IT69082/75A patent/IT1041566B/it active
- 1975-08-14 ES ES440243A patent/ES440243A1/es not_active Expired
- 1975-08-14 JP JP50098167A patent/JPS5837255B2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| LU73202A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1976-08-13 |
| AT366014B (de) | 1982-03-10 |
| DE2535937A1 (de) | 1976-02-26 |
| BE832408A (fr) | 1976-02-13 |
| NL177682C (nl) | 1985-11-01 |
| JPS5145113A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1976-04-17 |
| CH595291A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1978-02-15 |
| SE7509072L (sv) | 1976-02-16 |
| IT1041566B (it) | 1980-01-10 |
| JPS5837255B2 (ja) | 1983-08-15 |
| ATA629475A (de) | 1981-07-15 |
| CA1073213A (en) | 1980-03-11 |
| NO141749B (no) | 1980-01-28 |
| NO752828L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1976-02-17 |
| FR2281902B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1978-01-27 |
| NO141749C (no) | 1980-05-07 |
| GB1514317A (en) | 1978-06-14 |
| SE413397B (sv) | 1980-05-27 |
| NL7509629A (nl) | 1976-02-17 |
| FR2281902A1 (fr) | 1976-03-12 |
| ES440243A1 (es) | 1977-05-01 |
| DK368075A (da) | 1976-02-15 |
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