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公开(公告)号：US2993980A
公开(公告)日：1961-07-25
申请号：US83061359
申请日：1959-07-30
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： DUNN LEWIS H , TRIGG WARREN M
CPC classification number: C21D1/70 , C21D1/40 , H05B3/0004
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