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公开(公告)号：US3130770A
公开(公告)日：1964-04-28
申请号：US9318961
申请日：1961-03-03
Applicant: BRITISH FED WELDER , MACH COMPANY LTD
Inventor： FRANCIS TRIBE THOMAS
IPC: B21D39/02
CPC classification number: B21D39/021
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