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公开(公告)号:US2200628A
公开(公告)日:1940-05-14
申请号:US23326738
申请日:1938-10-04
申请人: LOFSTEDT WILLIAM J
发明人: LOFSTEDT WILLIAM J
CPC分类号: B23Q3/002 , B23C3/13 , Y10S29/079 , Y10S29/088 , Y10S29/098 , Y10S29/099 , Y10S82/901 , Y10T29/33 , Y10T29/5189 , Y10T409/309128