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公开(公告)号：US3132616A
公开(公告)日：1964-05-12
申请号：US8662561
申请日：1961-02-02
Applicant: BENTWORTH ENGINEERS N V
Inventor： HALE GERALD K , HALE ARTHUR W , HALE REGINALD D
IPC: B21C37/12
CPC classification number: B21C37/124 , B21C37/12 , B21C37/127 , Y10T82/16131
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