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公开(公告)号：US3504174A
公开(公告)日：1970-03-31
申请号：US3504174D
申请日：1967-04-28
Applicant: HITACHI LTD
Inventor： NISIWAKI KOJI , NAKAJIMA YASUO , HISAMOTO YASUHIDE , UENO YUKICHI
CPC classification number: H01J49/326 , H01J49/286
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