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发明名称
Antifriction sucker rod guide
摘要
申请公布号
US2198720(A)
申请公布日期
1940.04.30
申请号
US19380218597
申请日期
1938.07.11
申请人
ROBERT B. MOHR;DANIEL D. RICHARDS
发明人
EDGECOMB CLARK R.;PATTERSON EDGAR W.
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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