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经营范围
发明名称
Well heater
摘要
申请公布号
US2748868(A)
申请公布日期
1956.06.05
申请号
US19540444297
申请日期
1954.07.19
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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