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 235/60.28 - With zero recording controls

Subclass of Class 235 - Registers
Definition: Subject matter comprising devices for controlling the recording
No. of patents: 0