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发明名称
Secondary electron emitter and method of making it
摘要
申请公布号
US2171227(A)
申请公布日期
1939.08.29
申请号
US19380221565
申请日期
1938.07.27
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
SCHREINEMACHERS WILLEM J. H.
分类号
H01J1/32;H01J9/12
主分类号
H01J1/32
代理机构
代理人
主权项
地址
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