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发明名称
Automatic rheostat control
摘要
申请公布号
US2025987(A)
申请公布日期
1935.12.31
申请号
US19330681025
申请日期
1933.07.18
申请人
HOPE JOHN W
发明人
HOPE JOHN W.
分类号
主分类号
代理机构
代理人
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