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发明名称
Rock drill
摘要
申请公布号
US2756025(A)
申请公布日期
1956.07.24
申请号
US19490135676
申请日期
1949.12.29
申请人
CHARLES W. KANDLE
发明人
LAY WALTER H.
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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