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发明名称
WELL APPARATUS
摘要
申请公布号
GB2175031(B)
申请公布日期
1988.07.13
申请号
GB19860008894
申请日期
1986.04.11
申请人
* AVA INTERNATIONAL CORPORATION
发明人
NEIL HOOVER * AKKERMAN
分类号
E21B23/02;(IPC1-7):E21B23/02
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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