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

The first commercial microwave oven was nearly 6 feet tall and weighed in at 750 pounds.

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Class 301/93 - Both right- and left-threaded

Subclass of Class 301 - Land vehicles: wheels and axles
Definition: Wheel wherein the screw is provided at opposite ends with
No. of patents: 0