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公开(公告)号：US1070750A
公开(公告)日：1913-08-19
申请号：US1912712695
申请日：1912-08-01
Applicant: LEWIS M KEIZER , THUMM WILLIAM G
Inventor： THUMM WILLIAM G
CPC classification number: B23B29/14 , Y10T407/137 , Y10T407/2214 , Y10T407/224
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