"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 |
| 6609574 | Folding support frame An improved toolbar implement is described comprising a main support bar for attachment to a tractor, a pair of folding wings supported on a wheel assembly and connected to the main support bar, and a plurality of ground working tool assemblies attached t... | 08/26/2003 |
| 4098348 | Disc harrow with support wheels having interconnected separate mounting mechanisms A disc harrow having a pair of spaced support wheels each having its own operating mechanism including a hydraulic actuator for raising and lowering the respective wheel, but wherein the mechanisms are mechanically linked together to ensure substantially ... | 07/04/1978 |