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发明名称
Electric filter device
摘要
申请公布号
US2297215(A)
申请公布日期
1942.09.29
申请号
US19390272996
申请日期
1939.05.11
申请人
WOLFGANG HAGEN
发明人
HAGEN WOLFGANG
分类号
H04H20/81
主分类号
H04H20/81
代理机构
代理人
主权项
地址
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