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发明名称
Selective signaling system
摘要
申请公布号
US2153128(A)
申请公布日期
1939.04.04
申请号
US19360100848
申请日期
1936.09.15
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED;AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BACHELET ALBERT E.;HOLDEN WILLIAM H. T.
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
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地址
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