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经营范围
发明名称
Ringing Circuit
摘要
申请公布号
GB1185928(A)
申请公布日期
1970.03.25
申请号
GB19670040868
申请日期
1967.09.07
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
JEAN GARCIA
分类号
H04M3/02;H04Q3/52
主分类号
H04M3/02
代理机构
代理人
主权项
地址
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