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.
Toastmaster (appliances)
From 1929 until 1980, the brand was owned by McGraw Electric, renamed to McGraw-Edison in 1957. Following a leveraged buyout in 1980 to Magic Chef, the brand changed hands several times and finally went public in 1992 as Toastmaster, Inc. The company, headquartered in Boonville, Missouri, United States, was acquired by Salton, Inc., in 1999. After a series of acquisitions, the brand is now owned by Spectrum Brands, Inc. and is licensed to Select Brands, Inc. Commercial Toastmaster products for the food-service industry are manufactured by The Middleby Corporation. 
Company headquarters were moved from Boonville, Missouri to Columbia, Missouri during the 1970s. Factories were located in Boonville, Missouri, Macon, Missouri, Moberly, Missouri, Kirksville, Missouri, Clarence, Missouri and Laurinburg, North Carolina. Three large warehouse facilities were operated in Columbia, Missouri, too. Product brands included Toastmaster, Manning-Bowman, Edison, Everhot, Bersted, Eskimo fans, Zero fans, Ingram clocks and timers and several others. The Vita-Mix blender was also built under contract with Vita-Mix. Products manufactured during the 1970 and 1980 decades were toasters, griddles, box fans, waffle bakers, sandwich makers, ceiling fans, toaster ovens, convection ovens, bread makers, humidifiers, clocks, timers, etc. Other products marketed by the company in the 1970 and 1980 decades were imported from oversea factories such as mixers, meat slicers, can openers, microwave ovens, oscillating fans, etc. Revenues from a sandwich maker known as the Snackster (originally sold exclusively to Walmart) were significant and lead to the company going public on NYSE in 1992.