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发明名称
Apparatus for cementing wells
摘要
申请公布号
US2431751(A)
申请公布日期
1947.12.02
申请号
US19410397223
申请日期
1941.06.09
申请人
HAYWARD LANDES H
发明人
HAYWARD LANDES H.
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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