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发明名称
Dial controlled signaling system
摘要
申请公布号
US2345987(A)
申请公布日期
1944.04.04
申请号
US19420435658
申请日期
1942.03.21
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
NEISWINTER JAMES T.
分类号
H04L12/02
主分类号
H04L12/02
代理机构
代理人
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地址
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