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发明名称
DRIVE ASSEMBLY LOCK FOR DRILLING RIG
摘要
申请公布号
GB2233998(A)
申请公布日期
1991.01.23
申请号
GB19900015106
申请日期
1990.07.09
申请人
* NATIONAL-OILWELL
发明人
HERMAN P. * PRICE
分类号
E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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