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发明名称
TELEFOON - CONFERENTIE-VERSTERKERSCHAKELING.
摘要
申请公布号
NL171217(B)
申请公布日期
1982.09.16
申请号
NL19720009243
申请日期
1972.06.30
申请人
THE POST OFFICE TE LONDEN.
发明人
分类号
H04B3/06;H04M3/56;(IPC1-7):H04M3/56
主分类号
H04B3/06
代理机构
代理人
主权项
地址
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