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发明名称
Releasing washover overshot
摘要
申请公布号
US2616749(A)
申请公布日期
1952.11.04
申请号
US19470720324
申请日期
1947.01.06
申请人
HOUSTON OIL FIELD MATERIAL COMPANY
发明人
ALFORD RAYMOND G.
分类号
E21B31/18
主分类号
E21B31/18
代理机构
代理人
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地址
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