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公开(公告)号：US3017464A
公开(公告)日：1962-01-16
申请号：US77788458
申请日：1958-12-03
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： BOUGHTWOOD JOHN E , GRYBOWSKI THADDEUS M
IPC: H04L27/14
CPC classification number: H04L27/14
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