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发明名称
Apparatus for drilling mine-roof-bolt holes
摘要
申请公布号
US2766012(A)
申请公布日期
1956.10.09
申请号
US19490094369
申请日期
1949.05.20
申请人
JOY MANUFACTURING COMPANY
发明人
HALE RALPH FLETCHER
分类号
E21B15/04
主分类号
E21B15/04
代理机构
代理人
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地址
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