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发明名称
摘要
申请公布号
NL7117638(A)
申请公布日期
1972.06.27
申请号
NL19710017638
申请日期
1971.12.22
申请人
发明人
分类号
H04M3/22;(IPC1-7):H04Q3/72;H04Q1/30
主分类号
H04M3/22
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