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公开(公告)号：US2642548A
公开(公告)日：1953-06-16
申请号：US25328451
申请日：1951-10-26
Applicant: FED TELECOMM LAB INC
Inventor： WALLACE MILNER W
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007 , Y10S228/903
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