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发明名称
Deflecting drill bit
摘要
申请公布号
US2350986(A)
申请公布日期
1944.06.13
申请号
US19430485435
申请日期
1943.05.03
申请人
EASTMAN OIL WELL SURVEY COMPANY;EASTMAN OIL WELL SURVEY CORPORATION
发明人
COLLINS CHARLES P.
分类号
E21B7/06;E21B7/08;E21B10/00
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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