Joint connection for pipes

作者： Jean Louis Albert Duret

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参考文章(5)

Parker Arthur La Rue, Combined tube and pipe coupling ,(1929)

Frederick W Turnbull, Method of joining enamel lined pipes ,(1959)

Safford William Joseph, Sealed pipe coupling ,(1964)

Evans Seth, Threaded oil well drill stem connection with the threads having included crest angleof 90 degrees ,(1948)

George V Woodling, Sealed threaded connection ,(1954)