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 400/511.4 - By driving carbon paper roll directly from platen (e.g., by endless band)

Subclass of Class 400 - Typewriting machines
Definition: Subject matter wherein the force required to coil said carbon
No. of patents: 0