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经营范围
发明名称
Treatment of drilling fluids
摘要
申请公布号
US2692856(A)
申请公布日期
1954.10.26
申请号
US19500202215
申请日期
1950.12.22
申请人
NATIONAL LEAD COMPANY
发明人
LITMAN KAROL K.
分类号
E21B21/06
主分类号
E21B21/06
代理机构
代理人
主权项
地址
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