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公开(公告)号：US2858493A
公开(公告)日：1958-10-28
申请号：US59172956
申请日：1956-06-15
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： HULL ROBERT E , WALLACE JOHN W , YOUNKIN GEORGE W
IPC: B21B37/54
CPC classification number: B21B37/54
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