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发明名称
Potentiometer
摘要
申请公布号
US2297187(A)
申请公布日期
1942.09.29
申请号
US19390272606
申请日期
1939.05.09
申请人
JOHNSON MANFRED J
发明人
JOHNSON MANFRED J.
分类号
主分类号
代理机构
代理人
主权项
地址
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