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发明名称
Improvements in alternating-current potentiometers
摘要
申请公布号
GB342441(A)
申请公布日期
1931.02.05
申请号
GB19290036837
申请日期
1929.12.02
申请人
ALBERT CAMPBELL
发明人
分类号
G01R1/28
主分类号
G01R1/28
代理机构
代理人
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地址
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