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公开(公告)号：SU63278A1
公开(公告)日：1943-11-30
申请号：SU320253
申请日：1939-04-21
Applicant: BOCHKOV YA F , KUZNETSOV S V , SEDNEV D G , FITKEVICH M V
Inventor： BOCHKOV YA F , KUZNETSOV S V , SEDNEV D G , FITKEVICH M V
IPC: B23D43/04
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