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发明名称
IMPROVED ADJUSTABLE DRILLING MECHANISM
摘要
申请公布号
GB9300535(D0)
申请公布日期
1993.03.03
申请号
GB19930000535
申请日期
1993.01.13
申请人
LEE, PAUL B
发明人
分类号
E21B7/08;E21B17/07;E21B17/10;E21B23/04
主分类号
E21B7/08
代理机构
代理人
主权项
地址
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