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发明名称
Oil well heater
摘要
申请公布号
US2808110(A)
申请公布日期
1957.10.01
申请号
US19550555381
申请日期
1955.12.27
申请人
ELECTRONIC OIL WELL HEATER COMPANY
发明人
SPITZ SAMUEL
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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