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公开(公告)号：US742640A
公开(公告)日：1903-10-27
申请号：US1903152403
申请日：1903-04-13
Applicant: HAROLD JAMES ALBERT
Inventor： HAROLD JAMES ALBERT
CPC classification number: B23B31/201 , Y10T279/17547 , Y10T407/1825
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