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发明名称
FERNSPRECHUEBERTRAGUNGSSYSTEM MIT ECHOSPERREN
摘要
申请公布号
DE2050480(B2)
申请公布日期
1972.05.25
申请号
DE19702050480
申请日期
1970.10.14
申请人
发明人
分类号
H04B3/20;(IPC1-7):H04B3/20
主分类号
H04B3/20
代理机构
代理人
主权项
地址
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