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经营范围
发明名称
PCM TONE SIGNAL GENERATOR
摘要
申请公布号
GB2044040(B)
申请公布日期
1983.03.23
申请号
GB19800004802
申请日期
1980.02.13
申请人
NORTHERN TELECOM LTD
发明人
分类号
H04Q1/45;H04J3/10;H04J3/12;H04M19/02;H04Q1/457;H04Q11/04;(IPC1-7):H04Q11/04;H04M1/50
主分类号
H04Q1/45
代理机构
代理人
主权项
地址
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