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公开(公告)号：US2177326A
公开(公告)日：1939-10-24
申请号：US16280937
申请日：1937-09-07
Applicant: MORRIS FRANK P
Inventor： MORRIS FRANK P
IPC: B23B31/10 , B23B31/16 , B23B31/165
CPC classification number: B23B31/101 , Y10T279/1913
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