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发明名称
Circuit arrangement for automatically regulating side-tone damping of telephone stations
摘要
申请公布号
US2985722(A)
申请公布日期
1961.05.23
申请号
US19560629736
申请日期
1956.12.20
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT BERLIN AND MUNICH
发明人
HOESTERMANN KARL-ERNST
分类号
H04M1/58
主分类号
H04M1/58
代理机构
代理人
主权项
地址
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