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发明名称
Signaling system
摘要
申请公布号
US2306729(A)
申请公布日期
1942.12.29
申请号
US19410398887
申请日期
1941.06.20
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HOLDEN WILLIAM H. T.
分类号
H04M15/08;H04Q1/18;H04Q3/00
主分类号
H04M15/08
代理机构
代理人
主权项
地址
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