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发明名称
IMPROVEMENTS IN OR RELATING TO CENTRALLY CONTROLLED EXCHANGE SYSTEMS
摘要
申请公布号
GB1200154(A)
申请公布日期
1970.07.29
申请号
GB19690016072
申请日期
1969.03.27
申请人
SIEMENS AKTIENGESELLSCHAFT
发明人
分类号
H04Q3/545
主分类号
H04Q3/545
代理机构
代理人
主权项
地址
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