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经营范围
发明名称
RINGING CIRCUIT
摘要
申请公布号
EP0237303(B1)
申请公布日期
1991.11.06
申请号
EP19870301987
申请日期
1987.03.09
申请人
GPT LIMITED
发明人
ROBSON, MICHAEL ARTHUR CHARLES;CROSS, PETER ANDREW
分类号
H04M19/02
主分类号
H04M19/02
代理机构
代理人
主权项
地址
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