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公开(公告)号：US2248857A
公开(公告)日：1941-07-08
申请号：US23088238
申请日：1938-09-20
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： ERICKSON GEORGE L , BOUGHTWOOD JOHN E
IPC: H04L25/06
CPC classification number: H04L25/061
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