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公开(公告)号：US2472999A
公开(公告)日：1949-06-14
申请号：US59751245
申请日：1945-06-04
Applicant: GEORGE E FAILING SUPPLY COMPAN
Inventor： LEE ALEXANDER EMMETT , WOOD BRAITHWAITE ALBERT
IPC: E21B7/02
CPC classification number: E21B7/021
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