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发明名称
Control means for oil well pumps
摘要
申请公布号
US2968707(A)
申请公布日期
1961.01.17
申请号
US19560623348
申请日期
1956.11.20
申请人
PERFECT CIRCLE CORPORATION
发明人
MARTIN EUGENE J.;KAISER WILLIAM H. F.
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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