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How is a Microwave Built? Microwave ovens have taken household convenience to a new level. They are designed to fit into cabinets on the walls or over kitchen islands. They are also manufactured using a variety of different materials. In 1940 the cavity magnetron tube emitting microwaves was created 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