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公开(公告)号：US2757565A
公开(公告)日：1956-08-07
申请号：US25315451
申请日：1951-10-25
Applicant: JOHN D GRAY
Inventor： FLUSKEY ROBERT E , FLUSKEY EDWARD E
IPC: B23B13/12
CPC classification number: B23B13/126 , Y10T29/5126 , Y10T82/2597
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