"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 6644909 | Overhead runway transportation hanger with load raising and lowering system A hanger for transportation of objects along a suspended runway includes an upper part constrained to run along a runway and a lower part which supports the load and is connected to the upper part through a raising and lowering system. Between the two par... | 11/11/2003 |