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公开(公告)号：US1864786A
公开(公告)日：1932-06-28
申请号：US50555230
申请日：1930-12-30
Applicant: WILKINS ARTEMAS O
Inventor： WILKINS ARTEMAS O
IPC: B23B31/20
CPC classification number: B23B31/201 , Y10T279/17529 , Y10T279/3425
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