Microwave oven
The development of the cavity magnetron in the UK made possible the production of electromagnetic waves of a small enough wavelength (microwaves). American engineer Percy Spencer is generally credited with inventing the modern microwave oven after World War II from radar technology developed during the war. Named the "Radarange", it was first sold in 1946. Raytheon later licensed its patents for a home-use microwave oven that was first introduced by Tappan in 1955, but these units were still too large and expensive for general home use. Sharp Corporation introduced the first microwave oven with a turntable between 1964 and 1966. The countertop microwave oven was first introduced in 1967 by the Amana Corporation. After Sharp introduced low-cost microwave ovens affordable for residential use in the late 1970s, their use spread into commercial and residential kitchens around the world. In addition to their use in cooking food, types of microwave ovens are used for heating in many industrial processes.
KitchenAid
The first machine to carry the KitchenAid name was the ten-quart C-10 model, introduced in 1918 and built at Hobart's "Troy Metal Products" subsidiary in Springfield, Ohio. Prototype models were given to the wives of factory executives, and the product was named when one stated "I don't care what you call it, but I know it's the best kitchen aid I've ever had!" They were initially marketed to the farmhouse kitchen and were available in hardware stores. But owing to
the difficulty in convincing retailers to take up the product, the company recruited a mostly female sales force, which sold the mixers door-to-door. The C-10 machine was also marketed heavily toward soda fountains and small commercial kitchens, and was also sold under the "FountainAid" and "BakersAid" model names.
In 1922, KitchenAid introduced the H-5 mixer as its new home-use offering. The H-5 mixer was smaller and lighter than the C-10, and had a more manageable five-quart bowl. The model "G" mixer, about half the weight of the "H-5" was released in August 1928. In the 1920s, several other companies introduced similar mixers, and the Sunbeam Mixmaster became the most popular among consumers until the 1950s.