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经营范围
发明名称
Improvements in or relating to vacuum electric tube devices
摘要
申请公布号
GB323888(A)
申请公布日期
1930.01.16
申请号
GB19280036280
申请日期
1928.12.08
申请人
ERNEST YEOMAN ROBINSON;EDWARD JOHN EGERTON HUBBARD;METROPOLITAN-VICKERS ELECTRICAL COMPANY LIMITED
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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