"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 |
| 6910418 | Variable pattern stamp A variable pattern stamp has a base and a stamp plate unit. The base has smooth face and preferably is transparent. The stamp plate unit has multiple pattern plates and a protective sheet. The pattern plates have different or the same patterns and are preferably tra... | 06/28/2005 |
| 6766733 | Interchangeable flexible die A flexible die is provided which incorporates a base die and a superimposed interchangeable cutting or embossing die. The base die is generally planar and is adapted to securely receiving the superimposed interchangeable die thereon. Protruding upwardly from the out... | 07/27/2004 |
| 6082261 | Narrow-gap plate cylinder with plates attached to partially cylindrical shells A plate cylinder including a plate cylinder body; a first partially cylindrical image carrying shell and a second partially cylindrical image carrying shell, the shells being removably fastened to the plate cylinder body. Printing plates can be prefastene... | 07/04/2000 |