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

"What can be more palpably absurd than the prospect held out of locomotives traveling twice as fast as stagecoaches?"

The Quarterly Review ; March edition, 1825

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Class 213/157 - Detachable ears

Subclass of Class 213 - Railway draft appliances
Definition: Wherein devices of the class indicated the ears are removable.
No. of patents: 0