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发明名称
Well drilling device
摘要
申请公布号
US3360047(A)
申请公布日期
1967.12.26
申请号
US19650456653
申请日期
1965.05.18
申请人
BURNETT BOB J
发明人
BURNETT BOB J.
分类号
E21B17/04;E21B21/10;E21B34/06
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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