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经营范围
发明名称
Improvements in or relating to electronic switching tubes
摘要
申请公布号
GB741148(A)
申请公布日期
1955.11.30
申请号
GB19530004542
申请日期
1953.02.18
申请人
PHILIPS ELECTRICAL INDUSTRIES LIMITED
发明人
分类号
H01J31/06
主分类号
H01J31/06
代理机构
代理人
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