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经营范围
发明名称
Well cementing devices
摘要
申请公布号
GB619740(A)
申请公布日期
1949.03.14
申请号
GB19460037759
申请日期
1946.12.23
申请人
BAKER OIL TOOLS, INC.
发明人
分类号
E21B33/14
主分类号
E21B33/14
代理机构
代理人
主权项
地址
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