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

"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"

David Sarnoff, American radio pioneer ; 1921

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Class 191/19 - Traveling controller

Subclass of Class 191 - Electricity: transmission to vehicles
Definition: Means of the normally dead section type in which the feeder
No. of patents: 0