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公开(公告)号：US2535039A
公开(公告)日：1950-12-26
申请号：US74253147
申请日：1947-04-19
Applicant: FED TELECOMM LAB INC
Inventor： MALCOLM CHARCHIAN BENJAMIN
IPC: H01J19/80
CPC classification number: H01J19/80
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