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发明名称
Well centering and cementing device
摘要
申请公布号
US3289767(A)
申请公布日期
1966.12.06
申请号
US19610150033
申请日期
1961.11.03
申请人
B & W INCORPORATED
发明人
SEWARD EDWIN R.;MYERS SIDNEY C.
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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