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公开(公告)号：US2299228A
公开(公告)日：1942-10-20
申请号：US25046839
申请日：1939-01-12
Applicant: RADIO PATENTS CORP
Inventor： GRAY DONALD E , OLLIER JOSEPH O
IPC: H01G9/052
CPC classification number: H01G9/052 , Y10S29/031 , Y10T29/417 , Y10T29/435
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