发明授权
- 专利标题: Rail-tie.
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申请号: US1909490892申请日: 1909-04-19
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公开(公告)号: US941913A公开(公告)日: 1909-11-30
- 发明人: CHURCHILL WILLIAM , O'NEIL MURT L
- 申请人: CHURCHILL WILLIAM , O'NEIL MURT L
- 专利权人: William Churchill,Murt L O'neil
- 当前专利权人: William Churchill,Murt L O'neil
- 优先权: US1909490892 1909-04-19