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发明名称
ROERTANG.
摘要
申请公布号
NO157872(B)
申请公布日期
1988.02.22
申请号
NO19820003757
申请日期
1982.11.11
申请人
HUGHES TOOL COMPANY
发明人
RENFRO, JAMES G.
分类号
E21B3/04;E21B19/08;E21B19/16;E21B19/18;G21C19/20;(IPC1-7):E21B19/16
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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