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经营范围
发明名称
A SYSTEM TO USE TELEPHONE ENHANCEMENT
摘要
申请公布号
GB8915999(D0)
申请公布日期
1989.08.31
申请号
GB19890015999
申请日期
1989.07.13
申请人
CAIN, RICHARD
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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