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公开(公告)号：US2136465A
公开(公告)日：1938-11-15
申请号：US10296336
申请日：1936-09-28
Applicant: GUIBERSON CORP
Inventor： ALBERT PRANGER , CARRINGTON HOMER F
IPC: E21B33/08
CPC classification number: E21B33/08 , Y10T137/9682
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