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1.Carrier telephone system and supervisory signaling arrangement therefor 失效
Title translation: 载波电话系统及其监控信令安排公开(公告)号:US2624806A
公开(公告)日:1953-01-06
申请号:US76164647
申请日:1947-07-17
Applicant: INT STANDARD ELECTRIC CORP
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公开(公告)号:US2572074A
公开(公告)日:1951-10-23
申请号:US3743648
申请日:1948-07-07
Applicant: INT STANDARD ELECTRIC CORP
IPC: H04Q1/45
CPC classification number: H04Q1/45
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公开(公告)号:US2651684A
公开(公告)日:1953-09-08
申请号:US8586249
申请日:1949-04-06
Applicant: INT STANDARD ELECTRIC CORP
IPC: H04Q1/453
CPC classification number: H04Q1/4535
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公开(公告)号:US2577755A
公开(公告)日:1951-12-11
申请号:US2343848
申请日:1948-04-27
Applicant: INT STANDARD ELECTRIC CORP
IPC: H04Q1/446
CPC classification number: H04Q1/4465
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