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发明名称
ELECTRIC FILTER
摘要
申请公布号
CA380325(A)
申请公布日期
1939.03.28
申请号
CAD380325
申请日期
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
FREDERICK JAMES GIVEN
分类号
主分类号
代理机构
代理人
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