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发明名称
CATHODE FOR ELECTRON DISCHARGE DEVICES
摘要
申请公布号
CA312196(A)
申请公布日期
1931.06.09
申请号
CAD312196
申请日期
申请人
THE ROGERS RADIO TUBES
发明人
HENRY W. PARKER
分类号
主分类号
代理机构
代理人
主权项
地址
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