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How is a Microwave Built? Microwave ovens have brought home convenience to a new level. They can be positioned in wall cabinets or on the top of kitchen islands. They are constructed from a variety materials. In 1940 the cavity magnetron device emitting microwaves was developed at Birmingham University in England. Percy Spencer discovered that this device could cook food after watching corn pop, and eggs cook. Raw Materials Microwave (MW) heating is becoming popular in the industry of material processing due t