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公开(公告)号：US2815464A
公开(公告)日：1957-12-03
申请号：US37201153
申请日：1953-08-03
Applicant: INT STANDARD ELECTRIC CORP
Inventor： WILLIAM WRIGHT WALTER , PETER WELCH , ARTHUR DAY DENNIS
CPC classification number: H03D7/10 , H01J21/20 , H01J2893/003
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