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发明名称
Improvements in and relating to electric testing instruments, more particularly for testing thermionic valves and measuring resistances
摘要
申请公布号
GB420762(A)
申请公布日期
1934.12.07
申请号
GB19330019818
申请日期
1933.07.13
申请人
FRANK ROOKE
发明人
分类号
G01R31/25
主分类号
G01R31/25
代理机构
代理人
主权项
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