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发明名称
TONE SIGNAL DETECTORS
摘要
申请公布号
GB2011689(B)
申请公布日期
1982.03.24
申请号
GB19780049924
申请日期
1978.12.22
申请人
NIPPON ELECTRIC CO LTD
发明人
分类号
H04L27/00;G01R23/00;G08B3/10;H04Q1/448;H04W88/02;(IPC1-7):H04Q1/44
主分类号
H04L27/00
代理机构
代理人
主权项
地址
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