Microwave oven
In 1947, Raytheon built the "Radarange", the first commercially available microwave oven. It was almost tall, weighed and cost about US$5,000 ($ in dollars) each. It consumed 3 kilowatts, about three times as much as today's microwave ovens, and was water-cooled. The name was the winning entry in an employee contest. An early Radarange was installed (and remains) in the galley of the nuclear-powered passenger/cargo ship NS "Savannah". An early commercial model introduced in 1954 consumed 1.6 kilowatts and sold for US$2,000 to US$3,000 ($ to $ in dollars). Raytheon licensed its technology to the Tappan Stove company of Mansfield, Ohio in 1952. They tried to market a large 220 volt wall unit as a home microwave oven in 1955 for a price of US$1,295 ($ in dollars), but it did not sell well.
Partridge Wilson Engineering
In February 1937, they produced what they claimed was the first all-electric mobile fish-and-chips saloon. Beneath a serving counter was an oven, which was fitted with two sets of electric elements. One set could be plugged into a mains electrical socket, and was used to bring the oven up to temperature. Once it was hot, the second set were powered from the vehicle's battery, but the amount of current drawn was somewhat lower, as it only had to maintain the temperature. Two months later, they showcased a mobile milk bar, complete with egg-whisking machines, fountains and a refrigerator, again powered from the vehicle battery. A milk tank held of milk. Later in the year they held a competition for ideas to improve or develop their products. Prizes of 10, 5 and 3 guineas were offered.