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公开(公告)号：US2631237A
公开(公告)日：1953-03-10
申请号：US2591648
申请日：1948-05-08
Applicant: FED TELECOMM LAB INC
Inventor： WILLIAM SICHAK , SALVATORE MILAZZO
CPC classification number: H01Q21/26 , H01Q21/205
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