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How is a Microwave Built? Microwaves have taken household convenience to an entirely new level. They are designed to fit into cabinets on the walls or over kitchen islands. They are constructed of a variety of materials. The cavity magnetron tube emitting microwaves was first invented 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 has gained immense traction in the field of material processing because of its inher
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