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公开(公告)号：US1302690A
公开(公告)日：1919-05-06
申请号：US24616018
申请日：1918-07-22
Applicant: WILLIAM O MAXWELL
Inventor： SCHWAB HENRY
CPC classification number: B23P6/007 , B23K2201/001 , Y10T29/49737
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