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经营范围
发明名称
TELEPHONE RING DETECTOR SYSTEM
摘要
申请公布号
GB8404671(D0)
申请公布日期
1984.03.28
申请号
GB19840004671
申请日期
1984.02.22
申请人
TAD AVANTI INC
发明人
分类号
H04M1/654;(IPC1-7):H04M1/64
主分类号
H04M1/654
代理机构
代理人
主权项
地址
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