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发明名称
Selective signaling system
摘要
申请公布号
US2506429(A)
申请公布日期
1950.05.02
申请号
US19460673276
申请日期
1946.05.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MELICK JOHN M.
分类号
H04M1/515;H04Q3/42
主分类号
H04M1/515
代理机构
代理人
主权项
地址
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