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How is a Microwave Built? Microwave ovens have brought home convenience to a new level. They are designed to fit into cabinets on the walls or over kitchen islands. They are also constructed with a variety of materials. The cavity magnetron tube emitting microwaves was first developed in 1940 at Birmingham University in England. Percy Spencer discovered that this device could heat food after he watched corn pop, and eggs cook. Raw Materials Microwave (MW) heating has been gaining
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