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公开(公告)号：US2757448A
公开(公告)日：1956-08-07
申请号：US33633953
申请日：1953-02-11
Applicant: DIAMOND MATCH CO
Inventor： BROWN ROBERT C
IPC: B23P19/04
CPC classification number: B23P19/048 , Y10T29/49876 , Y10T29/53613 , Y10T29/53622
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