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发明名称
RENSEINNRETNING FOR BOREHULL.
摘要
申请公布号
NO874085(D0)
申请公布日期
1987.09.29
申请号
NO19870004085
申请日期
1987.09.29
申请人
CONOCO INC
发明人
CLARK, DAVID A.
分类号
E21B37/02;(IPC1-7):E21B37/00;E21B21/00
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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