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经营范围
发明名称
Automatic volume regulation
摘要
申请公布号
US1931070(A)
申请公布日期
1933.10.17
申请号
US19300482434
申请日期
1930.09.17
申请人
TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M. B. H.
发明人
GULLNER GEORG;ZEPLER ERICH
分类号
H03G1/04
主分类号
H03G1/04
代理机构
代理人
主权项
地址
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