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 368/237 - Screw

Subclass of Class 368 - Horology: time measuring systems or devices
Definition: Subject matter wherein the mounting or attaching means is
No. of patents: 0