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How is a Microwave Built? Microwave ovens have brought home convenience to a new level. They are designed to fit in wall cabinets or over kitchen islands. They are also manufactured using a variety of different materials. In 1940, the cavity magnetron tube emitting microwaves was invented at Birmingham University in England. Percy Spencer discovered that this device can cook food after watching eggs pop and corn cook. Raw Materials Microwave (MW) heating has been gaining immense popularity in the fie