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发明名称
Perfectionnement aux outils rotatifs de forage
摘要
申请公布号
FR1368216(A)
申请公布日期
1964.07.31
申请号
FR19630938400
申请日期
1963.06.17
申请人
CHRISTENSEN DIAMOND PRODUCTS CO
发明人
RITTER MARCEL GEORGES
分类号
E21B10/46
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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