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发明名称
Tubular element for use in a rotary drilling assembly
摘要
申请公布号
US4854399(A)
申请公布日期
1989.08.08
申请号
US19880141173
申请日期
1988.01.06
申请人
SHELL OIL COMPANY
发明人
ZIJSLING, DJURRE H.
分类号
E21B7/06;E21B17/10
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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