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公开(公告)号：US2804752A
公开(公告)日：1957-09-03
申请号：US56947456
申请日：1956-03-05
Applicant: NAT AUTOMATIC TOOL CO
Inventor： NORMAN RICHARD M , POWELL RUSSELL W
IPC: B29C45/82
CPC classification number: B29C45/82 , B29C2045/828
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