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发明名称
TELEPHONE TONE DETECTOR
摘要
申请公布号
GB2208775(A)
申请公布日期
1989.04.12
申请号
GB19880016797
申请日期
1988.07.14
申请人
* MITEL CORPORATION
发明人
MELVIN J * ROBERTS;FRANK * DEA
分类号
H04Q1/446;H04Q1/444;H04Q1/45;H04Q1/453
主分类号
H04Q1/446
代理机构
代理人
主权项
地址
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