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公开(公告)号：US2060825A
公开(公告)日：1936-11-17
申请号：US73822034
申请日：1934-08-03
Applicant: RADIO INVENTIONS INC
Inventor： RESSLER HUGH C , WILDER MARSHALL P
IPC: H01J29/62
CPC classification number: H01J29/624
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