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发明名称
DRILL COLLARS
摘要
申请公布号
US3431950(A)
申请公布日期
1969.03.11
申请号
USD3431950
申请日期
1966.08.22
申请人
SHELL OIL CO.
发明人
RAYMOND A. MALOTT
分类号
E21B17/16;(IPC1-7):F16L9/20
主分类号
E21B17/16
代理机构
代理人
主权项
地址
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