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发明名称
STABILISERS FOR BOREHOLE DRILLING
摘要
申请公布号
US3476196(A)
申请公布日期
1969.11.04
申请号
USD3476196
申请日期
1968.01.18
申请人
BRISTOL SIDDELEY ENGINES LTD.
发明人
FRANK WHITTLE;DEREK THOMAS
分类号
E21B17/10;(IPC1-7):E21B17/10;E21C9/00
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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