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公开(公告)号：US1777078A
公开(公告)日：1930-09-30
申请号：US36540129
申请日：1929-05-23
Applicant: ERVEN ROSS E
Inventor： ERVEN ROSS E
IPC: B23Q35/44
CPC classification number: B23Q35/44 , Y10T74/2101
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