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公开(公告)号：US3095089A
公开(公告)日：1963-06-25
申请号：US48416355
申请日：1955-01-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： BOUTON GEORGE M , HEISS JR JOHN H
IPC: B21C25/06
CPC classification number: B21C25/06
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