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公开(公告)号：US2670798A
公开(公告)日：1954-03-02
申请号：US10520749
申请日：1949-07-16
Applicant: PERFORATING GUNS ATLAS CORP
Inventor： OLIVER OWEN JOHNIE
IPC: E21B33/134 , E21B33/14
CPC classification number: E21B33/134 , E21B33/14
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