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发明名称
Mining drill
摘要
申请公布号
US2088759(A)
申请公布日期
1937.08.03
申请号
US19370124022
申请日期
1937.02.04
申请人
CENTRAL MINE EQUIPMENT CO.
发明人
RASSIEUR BENJAMIN F.
分类号
E21B17/046;E21B17/22
主分类号
E21B17/046
代理机构
代理人
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