Sealed pipe coupling

作者: Safford William Joseph

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参考文章(6)
George L Stewart, Connection for electric conduits. ,(1912)
Ernst R Koppel, Hot-water tank connection ,(1943)
Steinhoff Karl, Klas Dipl-Chem Dr Heinrich, Rohrverbindungsteil mit Innengewinde ,(1952)
Henry W Kachel, Method of making pipe joints ,(1931)