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1977-04-06 |
1978-10-24 |
Exxon Production Research Company |
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1981-03-03 |
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JPS57144048A
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1981-03-04 |
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Sumitomo Heavy Ind Ltd |
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1981-03-05 |
1982-09-16 |
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JPS57148557A
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1981-03-06 |
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Toshiba Corp |
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Mannesmann AG, 4000 Düsseldorf |
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Mannesmann AG, 4000 Düsseldorf |
Rohrverbindung für Metallrohre
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Sumitomo Metal Ind Ltd |
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1990-01-16 |
Baker Hughes Incorporated |
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1983-12-16 |
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Hydril Company |
Tubular connection
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Vallourec |
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1984-06-04 |
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Hunting Oilfield Services Ltd |
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