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发明名称
Well pumping rig
摘要
申请公布号
US1809102(A)
申请公布日期
1931.06.09
申请号
US19300422354
申请日期
1930.01.21
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.
分类号
E21B43/12;F04B47/02
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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