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发明名称
TELEPHONE RINGING CIRCUITS
摘要
申请公布号
GB1473878(A)
申请公布日期
1977.05.18
申请号
GB19740028878
申请日期
1974.06.28
申请人
PERSON J;PAYS G;GARNIER J
发明人
分类号
H04M19/04;(IPC1-7):H04M3/02
主分类号
H04M19/04
代理机构
代理人
主权项
地址
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