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经营范围
发明名称
Improvements in or relating to thermionic valve circuit arrangements
摘要
申请公布号
GB381233(A)
申请公布日期
1932.10.03
申请号
GB19310019269
申请日期
1931.07.03
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H03F3/28;H03F3/32
主分类号
H03F3/28
代理机构
代理人
主权项
地址
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