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经营范围
发明名称
Improvements in or relating to rock drilling apparatus
摘要
申请公布号
GB474379(A)
申请公布日期
1937.10.29
申请号
GB19360012189
申请日期
1936.04.29
申请人
THE CLEVELAND ROCK DRILL COMPANY
发明人
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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