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经营范围
发明名称
Oil well pumping unit
摘要
申请公布号
US2274601(A)
申请公布日期
1942.02.24
申请号
US19390282388
申请日期
1939.07.01
申请人
PALMER-BEE COMPANY
发明人
HARTGERING JOHN M.;PERKINS CHARLES M.
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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