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经营范围
发明名称
Closed circuit method of circulating a substantially solid free drilling fluid
摘要
申请公布号
USRE30230(E1)
申请公布日期
1980.03.18
申请号
US05/803601
申请日期
1977.06.06
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
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