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经营范围
发明名称
Signaling system
摘要
申请公布号
US2111615(A)
申请公布日期
1938.03.22
申请号
US19370143248
申请日期
1937.05.18
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
CRAMER WALTER W.
分类号
H04L12/18
主分类号
H04L12/18
代理机构
代理人
主权项
地址
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