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1990-09-28
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1985-02-06
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1997-08-15
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1991-09-25
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1991-11-08
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1992-11-19
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1992-06-24
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1991-09-23
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1992-02-10
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1992-10-21
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1983-12-07
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1986-09-10
Improvements in sealing pipe and like flanged joints
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1991-11-27
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1991-09-04
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1990-03-28
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1990-07-18
Pipe joints and couplings
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1993-04-07
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1992-03-25
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Pipe joint in particular for pipes made of plastic