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发明名称
Drag bit
摘要
申请公布号
US3180440(A)
申请公布日期
1965.04.27
申请号
US19620248728
申请日期
1962.12.31
申请人
JERSEY PRODUCTION RESEARCH COMPANY
发明人
BRIDWELL HAROLD C.
分类号
E21B10/54;E21B10/56;E21B10/60
主分类号
E21B10/54
代理机构
代理人
主权项
地址
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