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公开(公告)号：US2673275A
公开(公告)日：1954-03-23
申请号：US19109550
申请日：1950-10-20
Applicant: HELMUT KREFT
Inventor： HELMUT KREFT
IPC: B23K11/087
CPC classification number: B23K11/0876 , B23K2201/12
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