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发明名称
Variable leverage oil field pump jack
摘要
In a heavy-duty pump jack as used in oil well pumping, a leverage beam is oscillated by a motor-driven crank and the leverage beam acts upon the walking beam through an adjustable stroke controller.
申请公布号
US4492126(A)
申请公布日期
1985.01.08
申请号
US19820378509
申请日期
1982.05.17
申请人
DAVIS, C. ARTHUR
发明人
DAVIS, C. ARTHUR
分类号
F04B47/02;(IPC1-7):F16H21/32
主分类号
F04B47/02
代理机构
代理人
主权项
地址
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