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公开(公告)号：US2661929A
公开(公告)日：1953-12-08
申请号：US2483948
申请日：1948-05-03
Applicant: H E FLETCHER COMPANY
Inventor： ASPELIN FRANS E
IPC: B23B47/28
CPC classification number: B23B47/28 , B23B2247/04 , B23B2247/10
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