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Patent US4623173 - Screw joint coupling for oil pipes ...
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Patent US4623173 - Screw joint coupling for oil pipes ...
Website URL:
http://www.google.com/patents/US4623173
Category:
Fine Jewelry
1. A screw joint coupling for oil pipes, wherein a main sealing portion is provided with a sealing portion which is axially convex at an end of a male screw, and with ...
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