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经营范围
发明名称
Improvements in or relating to thermionic discharge devices
摘要
申请公布号
GB324653(A)
申请公布日期
1930.01.29
申请号
GB19280031331
申请日期
1928.10.29
申请人
THE M-O VALVE COMPANY LIMITED;CYRIL WILFRED COSGROVE
发明人
分类号
H01J1/20
主分类号
H01J1/20
代理机构
代理人
主权项
地址
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