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经营范围
发明名称
Improvements in or relating to electron discharge devices
摘要
申请公布号
GB486888(A)
申请公布日期
1938.06.13
申请号
GB19360034136
申请日期
1936.12.11
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED;GEORGE BALDWIN BANKS
发明人
分类号
H01J43/20
主分类号
H01J43/20
代理机构
代理人
主权项
地址
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