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发明名称
Rotary oil well drilling apparatus
摘要
申请公布号
US2084096(A)
申请公布日期
1937.06.15
申请号
US19370128999
申请日期
1937.03.04
申请人
MARION LEWIS EVERETT
发明人
LEWIS EVERETT MARION
分类号
E21B4/00;E21B10/00
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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