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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
GB547971(A)
申请公布日期
1942.09.18
申请号
GB19420001933
申请日期
1941.02.10
申请人
FRANCOIS JOSEPH GERARD VAN DEN BOSCH;ERNEST THOMAS JAMES TAPP;VACUUM-SCIENCE PRODUCTS LIMITED
发明人
分类号
H01J21/36;H01J43/22
主分类号
H01J21/36
代理机构
代理人
主权项
地址
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