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发明名称
摘要
申请公布号
NL7106420(A)
申请公布日期
1971.11.17
申请号
NL19710006420
申请日期
1971.05.11
申请人
发明人
分类号
H04J1/20;H04W72/02;(IPC1-7):H04Q7/02
主分类号
H04J1/20
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