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发明名称
ECHOKOMPENSATIONSSCHALTUNG ZUR AUSLOESCHUNG VON ECHOS AUF FERNSPRECHLEITUNGEN
摘要
申请公布号
DE2011669(B2)
申请公布日期
1972.11.23
申请号
DE19702011669
申请日期
1970.03.12
申请人
发明人
分类号
H04B3/23
主分类号
H04B3/23
代理机构
代理人
主权项
地址
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