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经营范围
发明名称
Base structure for electron tubes
摘要
申请公布号
US2471005(A)
申请公布日期
1949.05.24
申请号
US19460693223
申请日期
1946.08.27
申请人
EITEL-MCCULLOUGH, INC.
发明人
NORTON ROBERT L.
分类号
H01J19/34
主分类号
H01J19/34
代理机构
代理人
主权项
地址
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