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发明名称
Crossover apparatus for oil and gas wells
摘要
申请公布号
US2970648(A)
申请公布日期
1961.02.07
申请号
US19560595260
申请日期
1956.07.02
申请人
SID W. RICHARDSON, INC.
发明人
DAFFIN DOUGLAS E.;JR. HAROLD E. MCGOWEN,
分类号
E21B43/14
主分类号
E21B43/14
代理机构
代理人
主权项
地址
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