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