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公开(公告)号:US1657384A
公开(公告)日:1928-01-24
申请号:US19083027
申请日:1927-05-12
Applicant: WESTERN UNION TELEGRAPH CO
Inventor: FOSTER LEE R
IPC: H04L25/04
CPC classification number: H04L25/44
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公开(公告)号:US2160139A
公开(公告)日:1939-05-30
申请号:US15353037
申请日:1937-07-14
Applicant: WESTERN UNION TELEGRAPH CO
Inventor: HAGLUND HAKON H , FOSTER LEE R
IPC: H04L13/06
CPC classification number: H04L13/06
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公开(公告)号:US1826928A
公开(公告)日:1931-10-13
申请号:US48840230
申请日:1930-10-13
Applicant: WESTERN UNION TELEGRAPH CO
Inventor: FOSTER LEE R
CPC classification number: H04L5/12 , H04L5/1423
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