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经营范围
发明名称
Combined mine drill, timber jack, and mine post
摘要
申请公布号
US2556357(A)
申请公布日期
1951.06.12
申请号
US19480057258
申请日期
1948.10.29
申请人
BALDWIN JOHN C
发明人
BALDWIN JOHN C.
分类号
E21B15/00;E21D15/24
主分类号
E21B15/00
代理机构
代理人
主权项
地址
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