发明授权
- 专利标题: Coal-mining machine
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申请号: US46879442申请日: 1942-12-12
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公开(公告)号: US2346679A公开(公告)日: 1944-04-18
- 发明人: EDWIN HAIR CHARLES , HAIR RICHARD T
- 申请人: EDWIN HAIR CHARLES , HAIR RICHARD T
- 专利权人: Hair Charles Edwin,Richard T Hair
- 当前专利权人: Hair Charles Edwin,Richard T Hair
- 优先权: US46879442 1942-12-12
- 主分类号: E21C37/08
- IPC分类号: E21C37/08
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