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经营范围
发明名称
Drilling system
摘要
申请公布号
US3381766(A)
申请公布日期
1968.05.07
申请号
US19640409735
申请日期
1964.11.09
申请人
CLYDE E. BANNISTER
发明人
BANNISTER CLYDE E.
分类号
E21B4/00;E21B4/02;E21B21/12;E21B33/127
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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