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发明名称
Braking devices and methods for use in drilling operations
摘要
申请公布号
AU2011253774(B2)
申请公布日期
2012.06.14
申请号
AU20110253774
申请日期
2011.12.01
申请人
LONGYEAR TM, INC.
发明人
DRENTH, CHRISTOPHER L.
分类号
E21B23/01
主分类号
E21B23/01
代理机构
代理人
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