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经营范围
发明名称
Improvements in or relating to closure members for vacuum tubes
摘要
申请公布号
GB550856(A)
申请公布日期
1943.01.27
申请号
GB19410009490
申请日期
1941.07.25
申请人
FRANCOIS JOSEPH GERARD VAN DEN BOSCH;VACUUM-SCIENCE PRODUCTS LIMITED
发明人
分类号
H01J5/40
主分类号
H01J5/40
代理机构
代理人
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地址
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