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公开(公告)号：US1861107A
公开(公告)日：1932-05-31
申请号：US49655421
申请日：1921-08-29
Applicant: RCA CORP
Inventor： JACQUES BIGUET
IPC: H01J19/42
CPC classification number: H01J19/42 , H01J2893/0002
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