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经营范围
发明名称
OIL BASED DRILLING FLUIDS
摘要
申请公布号
EP0403437(A3)
申请公布日期
1991.09.18
申请号
EP19900810430
申请日期
1990.06.13
申请人
SANDOZ LTD.;SANDOZ-PATENT-GMBH
发明人
BENNETT, BRIAN;GRAHAM, MARGARET HELEN
分类号
E21B21/00;C08G69/34;C08G69/36;C08L77/00;C08L77/08;C09K8/32;(IPC1-7):C09K7/06
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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