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How is a Microwave Built? Microwave ovens have taken household convenience to a whole new level. They are designed to fit in wall cabinets or over kitchen islands. They are constructed of a variety of materials. The cavity magnetron tube that emits microwaves was first developed in 1940 at Birmingham University in England. Percy Spencer realized that this device could heat food as he observed eggs and corn pop cook. Raw Materials Microwave (MW) heating is gaining a lot of attention in the f
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