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公开(公告)号：US1797667A
公开(公告)日：1931-03-24
申请号：US39034229
申请日：1929-09-04
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： MORGENSTERN RONALD V
IPC: H04L25/00
CPC classification number: H04L25/00
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公开(公告)号：US1758900A
公开(公告)日：1930-05-13
申请号：US25894828
申请日：1928-03-03
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： MORGENSTERN RONALD V
IPC: H04L5/20
CPC classification number: H04L5/20
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