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发明名称
Well heating apparatus
摘要
申请公布号
US2728396(A)
申请公布日期
1955.12.27
申请号
US19510256057
申请日期
1951.11.13
申请人
UNION OIL COMPANY OF CALIFORNIA
发明人
CARPENTER CLAYTON A.
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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