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经营范围
发明名称
Drilling mud
摘要
申请公布号
US2491436(A)
申请公布日期
1949.12.13
申请号
US19470760507
申请日期
1947.07.11
申请人
SUN OIL COMPANY
发明人
BARNES WILLIAM E.
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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