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发明名称
Ventiltre
摘要
申请公布号
NO986091(D0)
申请公布日期
1998.12.23
申请号
NO19980006091
申请日期
1998.12.23
申请人
EXPRO NORTH SEA LTD
发明人
EDWARDS, JEFFREY CHARLES;MORGAN, MICHAEL GRAHAM
分类号
E21B33/035;E21B34/04;(IPC1-7):E21B
主分类号
E21B33/035
代理机构
代理人
主权项
地址
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