发明授权
- 专利标题: Railway-tie.
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申请号: US1902137054申请日: 1902-12-29
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公开(公告)号: US738681A公开(公告)日: 1903-09-08
- 发明人: HELLER ROBLEY EUGENE
- 申请人: HELLER ROBLEY EUGENE
- 专利权人: Robley Eugene Heller
- 当前专利权人: Robley Eugene Heller
- 优先权: US1902137054 1902-12-29