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发明名称
ELECTRON DISCHARGE DEVICE CATHODE
摘要
申请公布号
CA390309(A)
申请公布日期
1940.07.30
申请号
CAD390309
申请日期
申请人
CANADIAN GENERAL ELECTRIC COMPANY
发明人
ALBERT W. HULL
分类号
主分类号
代理机构
代理人
主权项
地址
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