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发明名称
Timer controlled free piston well pumping apparatus
摘要
申请公布号
US3012513(A)
申请公布日期
1961.12.12
申请号
US19590813436
申请日期
1959.05.15
申请人
CAMCO, INC.
发明人
KNOX DONALD G.
分类号
F04B47/12
主分类号
F04B47/12
代理机构
代理人
主权项
地址
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