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发明名称
Einrichtung zur selbsttätigen Verstärkungsregelung in Fernsprechanlagen.
摘要
申请公布号
AT134785(B)
申请公布日期
1933.09.25
申请号
ATD134785
申请日期
1931.12.03
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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