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经营范围
发明名称
WELL DRILLING FLUIDS
摘要
申请公布号
GB8619007(D0)
申请公布日期
1986.09.17
申请号
GB19860019007
申请日期
1986.08.04
申请人
DRESSER INDUSTRIES INC
发明人
分类号
C09K8/20
主分类号
C09K8/20
代理机构
代理人
主权项
地址
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