"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 |
| 7367874 | Mandrel for working disks A mandrel or a clamping element for working disks, for example, separating disks, grinding disks and/or polishing disks, contains a shaft to fix the mandrel to a receiving element or to a clamping element of a working machine. The mandrel has a fixing element for de... | 05/06/2008 |
| 6669541 | Abrading method and holding device A method for grinding, polishing, buffing, scaling, and grooving a finish onto and into a workpiece. This method provides the versatility of a hand held type angle grinder to be used while being supported frog, a clamping device. Also provided is a means ... | 12/30/2003 |