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公开(公告)号：US2024762A
公开(公告)日：1935-12-17
申请号：US66064033
申请日：1933-03-14
Applicant: RCA CORP
Inventor： HEINRICH GEFFEKEN , HANS RICHTER , KARL MOLLER
IPC: H01J40/16
CPC classification number: H01J40/16
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