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发明名称
Well cementing device
摘要
申请公布号
US2202173(A)
申请公布日期
1940.05.28
申请号
US19390281901
申请日期
1939.06.29
申请人
STRAUB ALVIN L
发明人
STRAUB ALVIN L.
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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