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 238/178 - Flat

Subclass of Class 238 - Railways: surface track
Definition: Rail-joints for flat or webless rails.
No. of patents: 0