Overshot apparatus for manipulating a bridge plug in a well
作者： Kenneth W Beyer
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摘要:
lens.org 参考文章(3)
Mordica O Johnston, Dan B Chapman, Adjustable flow bean ,(1951)
John T Phipps, Locking and setting device ,(1945)
Iii James W Kisling, Multiple purpose well tools ,(1965)