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公开(公告)号：US2924737A
公开(公告)日：1960-02-09
申请号：US66032357
申请日：1957-05-20
Applicant: PHILIPS CORP
IPC: H01J9/04 , H01J17/06 , H01J61/067
CPC classification number: H01J61/0677 , H01J9/042 , H01J17/066 , H01J2893/0066
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