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

"There is no reason anyone would want a computer in their home."

Ken Olsen, chairman and founder of Digital Equipment Corporation ; 1977

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Class 246/376 - Overlapped main

Subclass of Class 246 - Railway switches and signals
Definition: Subject matter having single rails or sections of track
No. of patents: 0