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1989-05-02
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Annular gasket
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1978-05-16
Connector method and apparatus for coupling two systems together while excluding the environment from the system interiors
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Method of joining and sealing pipe sections
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1988-06-17
圧送用仮設配管の連結具
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1975-12-19
Sealing spigot and socket pipe joints in situ. - partic. for low humidity high pressure gas pipelines
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1975-11-25
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1989-10-16
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1986-11-14
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1983-07-08
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1988-04-25
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1984-04-02
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1985-12-11
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1987-08-25
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1986-05-21
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1989-06-05
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1990-10-02
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1986-08-09
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1990-11-05
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1983-02-28
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