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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 into cabinets on the walls or over kitchen islands. They are also constructed using a variety of different materials. The cavity magnetron tube emitting microwaves was first developed in 1940 at Birmingham University in England. Percy Spencer realized that this device could be used to heat food when he watched eggs pop and corn cook. Raw Materials Microwave (MW
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