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公开(公告)号：US2235072A
公开(公告)日：1941-03-18
申请号：US31197640
申请日：1940-01-02
Applicant: MUELLER BRASS CO
Inventor： IRVING PHILIP L , KUNKEL ERHART P
IPC: B21D9/07
CPC classification number: B21D9/073 , Y10T29/4944
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