If you live in the United States, odds are a machine much like those stacked on the right rests on a kitchen countertop in your home. If so, your microwave is a descendant of the device on the right. This is the first microwave oven, built by Massachusetts-based Raytheon in 1947; it operated for three decades in the kitchen of one of Raytheon's founders. Raytheon named the original microwave the "Radarange" because it cooked food using the same radio-wave-producing magnetron tubes that the company manufactured for use in military radar.

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