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经营范围
发明名称
WELL APPARATUS
摘要
申请公布号
GB8421991(D0)
申请公布日期
1984.10.03
申请号
GB19840021991
申请日期
1984.08.31
申请人
AVA INTERNATIONAL CORPORATION
发明人
分类号
E21B23/02;E21B23/06
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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