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公开(公告)号：US2504923A
公开(公告)日：1950-04-18
申请号：US4314348
申请日：1948-08-07
Applicant: PORTER CABLE MACHINE CO
Inventor： EMMONS ARTHUR N , ENLUND GUSTAF N
CPC classification number: B23B31/201 , B24D9/04
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