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How is a Microwave Built? Microwaves have elevated the convenience of home to a whole new level. They are designed to fit into cabinets on the walls or over kitchen islands. They are constructed from a variety of materials. The cavity magnetron tube that emits microwaves was invented in 1940 at Birmingham University in England. Percy Spencer realized that this device could be used to heat food when he observed eggs and corn pop cook. Raw Materials Microwave (MW) heating is growing in popular
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