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发明名称
OPPBLAASBART VERKTOEY.
摘要
申请公布号
NO904466(D0)
申请公布日期
1990.10.16
申请号
NO19900004466
申请日期
1990.10.16
申请人
BAKER HUGHES INCORPORATED
发明人
CORONADO, MARTIN P.
分类号
E21B33/127;(IPC1-7):E21B/
主分类号
E21B33/127
代理机构
代理人
主权项
地址
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