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公开(公告)号：US2527225A
公开(公告)日：1950-10-24
申请号：US61152245
申请日：1945-08-20
Applicant: BAASH ROSS TOOL CO
Inventor： LANGSTAFF CLINTON A , BLASITO BRONZAN
IPC: E21B33/06
CPC classification number: E21B33/06
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