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公开(公告)号：US1757542A
公开(公告)日：1930-05-06
申请号：US9521626
申请日：1926-03-17
Applicant: FOREST RADIO COMPANY DE
Inventor： NICKL EDWIN F , CLEVELAND RALPH E
IPC: H01J9/24
CPC classification number: H01J9/24 , Y10T29/519
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