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发明名称
Signaling system
摘要
申请公布号
US1804675(A)
申请公布日期
1931.05.12
申请号
US19270171971
申请日期
1927.03.02
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
CLAUSEN HENRY P.
分类号
H04W52/02
主分类号
H04W52/02
代理机构
代理人
主权项
地址
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