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经营范围
发明名称
Improved drill
摘要
申请公布号
GB665920(A)
申请公布日期
1952.02.06
申请号
GB19490002000
申请日期
1949.01.25
申请人
HOUILLERES DU BASSIN DU NORD ET DU PAS-DE-CALAIS
发明人
CHENELLE RENE GEORGES
分类号
E21B7/02;E21B19/24;E21D9/10
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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