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公开(公告)号：US2977829A
公开(公告)日：1961-04-04
申请号：US56866356
申请日：1956-02-29
Applicant: MASCH UND PRAZISIONSWERKZEUGF
Inventor： EUGEN THOMA
IPC: B23D77/04
CPC classification number: B23D77/044 , B23D2277/201 , B23D2277/46 , Y10T408/8598 , Y10T408/8928
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