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公开(公告)号：US2972268A
公开(公告)日：1961-02-21
申请号：US65138757
申请日：1957-04-08
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： WALLACE JOHN W , HULL ROBERT E , MOORE RAYMOND W
IPC: B21B37/16
CPC classification number: B21B37/16
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