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经营范围
发明名称
Selective ringing circuits
摘要
申请公布号
US2824175(A)
申请公布日期
1958.02.18
申请号
US19540469633
申请日期
1954.11.18
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MEACHAM LARNED A.;WEST FRED
分类号
F16K3/02;H04Q5/00
主分类号
F16K3/02
代理机构
代理人
主权项
地址
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