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发明名称
Method and apparatus for determining drill bit speed
摘要
申请公布号
US2985829(A)
申请公布日期
1961.05.23
申请号
US19570686990
申请日期
1957.09.30
申请人
WELL SURVEYS, INC.
发明人
SWIFT GILBERT
分类号
E21B44/00;E21B45/00;E21B47/00;G01P3/48
主分类号
E21B44/00
代理机构
代理人
主权项
地址
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