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公开(公告)号：US1987595A
公开(公告)日：1935-01-15
申请号：US61633432
申请日：1932-06-09
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： CORWITH HOWARD P , HAGLUND HAKON H
IPC: H04L7/00
CPC classification number: H04L7/0095
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