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经营范围
发明名称
Well cementing device
摘要
申请公布号
US2204658(A)
申请公布日期
1940.06.18
申请号
US19380245241
申请日期
1938.12.12
申请人
BAKER OIL TOOLS, INC.
发明人
BURT CLARENCE E.
分类号
E21B33/134
主分类号
E21B33/134
代理机构
代理人
主权项
地址
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