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发明名称
Oil well heater
摘要
申请公布号
US2767793(A)
申请公布日期
1956.10.23
申请号
US19530399388
申请日期
1953.12.21
申请人
ROBERT P. LAIR
发明人
KRAMER EARNEST H.
分类号
E21B36/02
主分类号
E21B36/02
代理机构
代理人
主权项
地址
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