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How is a Microwave Built? Microwave ovens have brought household convenience to a whole new level. They are designed to fit inside cabinets on the walls or over kitchen islands. They are also manufactured with a variety of materials. In 1940 the cavity magnetron tube emitting microwaves was developed 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 gained immense tr
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