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经营范围
发明名称
Ensemble de têtes de forage
摘要
申请公布号
FR1168941(A)
申请公布日期
1958.12.18
申请号
FRD1168941
申请日期
1956.11.30
申请人
DON R. HINDERLITER, INC.
发明人
分类号
E21B33/04
主分类号
E21B33/04
代理机构
代理人
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