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发明名称
METHODS AND APPARATUS FOR DIGITALLY SIGNALLING SOUNDS AND TONES IN A PCM MULTIPLEX SYSTEM
摘要
申请公布号
GB2029166(A)
申请公布日期
1980.03.12
申请号
GB19790027689
申请日期
1979.08.08
申请人
WESCOM SWITCHING INC
发明人
分类号
H04Q1/457;(IPC1-7):H04M19/02;H03K13/01
主分类号
H04Q1/457
代理机构
代理人
主权项
地址
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