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公开(公告)号：US1597731A
公开(公告)日：1926-08-31
申请号：US56284322
申请日：1922-05-22
Applicant: OTTO SEIFFERT
Inventor： OTTO SEIFFERT
CPC classification number: B23B31/223 , B23B31/1269 , Y10T279/17726
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