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公开(公告)号：US3225204A
公开(公告)日：1965-12-21
申请号：US14375761
申请日：1961-10-09
Applicant: PHILIPS CORP
Inventor： PIETER SCHAGEN , GEORGE TAYLOR DONALD , WALTERS WOODHEAD ALFRED
IPC: H01J31/50
CPC classification number: H01J31/501
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