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发明名称
DIRECTIONAL AERIAL SYSTEM
摘要
申请公布号
CA309030(A)
申请公布日期
1931.03.03
申请号
CAD309030
申请日期
申请人
THE CANADIAN MARCONI COMPANY
发明人
CHARLES SAMUEL FRANKLIN
分类号
主分类号
代理机构
代理人
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