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公开(公告)号:US2808638A
公开(公告)日:1957-10-08
申请号:US47364554
申请日:1954-12-07
申请人: ALBERT O BEMISS
发明人: FILIPPI JOSEPH C
CPC分类号: B23B27/00 , B23B27/16 , B23B27/1633 , B23B27/1655 , B23B27/22 , Y10T407/11 , Y10T407/2234 , Y10T407/2242 , Y10T407/2244 , Y10T407/2256