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发明名称
TELECOMMUNICATION EXCHANGES
摘要
申请公布号
GB1281795(A)
申请公布日期
1972.07.12
申请号
GB19710022026
申请日期
1971.04.19
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
分类号
H04Q3/54
主分类号
H04Q3/54
代理机构
代理人
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