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发明名称
Well heater
摘要
申请公布号
US2202034(A)
申请公布日期
1940.05.28
申请号
US19370145739
申请日期
1937.06.01
申请人
THOMAS WILLIAM K
发明人
THOMAS WILLIAM K.
分类号
E21B36/04
主分类号
E21B36/04
代理机构
代理人
主权项
地址
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