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发明名称
Roof bolting drill
摘要
申请公布号
US3181625(A)
申请公布日期
1965.05.04
申请号
US19610135392
申请日期
1961.07.25
申请人
JOY MANUFACTURING COMPANY
发明人
DENSMORE NEAL W.
分类号
E21B7/02;E21B19/083
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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