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公开(公告)号：US3356971A
公开(公告)日：1967-12-05
申请号：US25630351
申请日：1951-11-14
Applicant: ARF PRODUCTS
Inventor： PAKAN JOHN J
CPC classification number: H01P7/00 , H03B5/1805 , H03B2201/014
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公开(公告)号：US2106771A
公开(公告)日：1938-02-01
申请号：US7394036
申请日：1936-04-11
Applicant: AMERICAN TELEPHONE & TELEGRAPH
Inventor： CLARK SOUTHWORTH GEORGE
CPC classification number: H03B5/1835 , H03B5/1817 , H03B2201/014 , H04B3/52
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