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经营范围
发明名称
Rock drill
摘要
申请公布号
US1965491(A)
申请公布日期
1934.07.03
申请号
US19320600807
申请日期
1932.03.23
申请人
ROBBINS CURTIS JOSEPH
发明人
CURTIS JOSEPH ROBBINS
分类号
E21B10/36
主分类号
E21B10/36
代理机构
代理人
主权项
地址
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