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"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 |
| 4673319 | Major-minor tool shank for machine tool A major-minor tool shank for a machine tool including a major tool shank for fitting a minor stool shank therein. One end of the major tool shank is a minor taper pot provided with a lock mechanism for locking the minor tool shank, the lock mechanism incl... | 06/16/1987 |
| 4404728 | Tool pot cleaning system for tool magazine A tool pot cleaning system for use by installing in a tool magazine of an automatic tool exchanger in machine tool. The tool pot cleaning system, installed in a tool magazine, equipped with a number of tool pots supported radically with an angle of elevat... | 09/20/1983 |
