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公开(公告)号：US3363191A
公开(公告)日：1968-01-09
申请号：US41303864
申请日：1964-11-23
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： BOUGHTWOOD JOHN E , HAROLD HARRIS
CPC classification number: H03F3/343 , H04L25/0274 , H04L25/10
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