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发明名称
Echosperre fuer einen Sprechkreis auf einem Vierdrahtuebertragungssystem
摘要
申请公布号
DE1921018(B1)
申请公布日期
1971.01.14
申请号
DE19691921018
申请日期
1969.04.24
申请人
SIEMENS AG
发明人
BENDEL HERMANN
分类号
H04B3/21;(IPC1-7):H04B3/20
主分类号
H04B3/21
代理机构
代理人
主权项
地址
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