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发明名称
摘要
申请公布号
FR2275945(B1)
申请公布日期
1981.10.23
申请号
FR19750016779
申请日期
1975.05.29
申请人
POST OFFICE
发明人
分类号
H04J3/06;H04Q11/04;(IPC1-7):H04L7/00
主分类号
H04J3/06
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代理人
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