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发明名称
Procedure for measuring the rate of penetration of a drill bit
摘要
申请公布号
US4843875(A)
申请公布日期
1989.07.04
申请号
US19880186509
申请日期
1988.04.26
申请人
SCHLUMBERGER TECHNOLOGY CORPORATION
发明人
KERBART, YVES
分类号
E21B44/00;E21B45/00
主分类号
E21B44/00
代理机构
代理人
主权项
地址
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