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发明名称
System and method for monitoring drill bit depth
摘要
申请公布号
US4976143(A)
申请公布日期
1990.12.11
申请号
US19890417174
申请日期
1989.10.04
申请人
ANADRILL, INC.
发明人
CASSO, CHRISTOPHER G.
分类号
E21B45/00;E21B47/04
主分类号
E21B45/00
代理机构
代理人
主权项
地址
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