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发明名称
MEJORAS EN BROCA ROTATORIA PARA BARRENADO DE PARED PROFUNDA
摘要
申请公布号
MX155882(A)
申请公布日期
1988.01.27
申请号
MX19810189428
申请日期
1981.09.30
申请人
NORTON CHRISTENSE, INC.
发明人
RAINER JURGENS
分类号
E21B10/42;E21B10/43;E21B10/46;E21B10/56;E21B10/567;(IPC1-7):E21B10/46;E21B10/60
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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