U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

"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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Class 340/815.91 - Having restoring means

Subclass of Class 340 - Communications: electrical
Definition: Subject matter comprising means for resetting the released
No. of patents: 0