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发明名称
WELL APPARATUS
摘要
申请公布号
GB8729089(D0)
申请公布日期
1988.01.27
申请号
GB19870029089
申请日期
1987.12.14
申请人
AVA INTERNATIONAL CORPORATION
发明人
分类号
E21B34/00;E21B34/10
主分类号
E21B34/00
代理机构
代理人
主权项
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