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公开(公告)号：US2607417A
公开(公告)日：1952-08-19
申请号：US4391748
申请日：1948-08-12
Applicant: PERFORATING GUNS ATLAS CORP
Inventor： HONORE CASTEL JACQUES
IPC: E21B43/116
CPC classification number: E21B43/116
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