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发明名称
Mining drill
摘要
申请公布号
US2341237(A)
申请公布日期
1944.02.08
申请号
US19430496514
申请日期
1943.07.28
申请人
CENTRAL MINE EQUIPMENT CO.
发明人
PHIPPS ORVILLE
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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