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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 on top of kitchen islands. They are made from a variety of materials. In 1940, the cavity magnetron tube emitting microwaves was invented at Birmingham University in England. Percy Spencer discovered that this device could heat food after he watched the corn pop and eggs cook. Raw Materials Microwave (MW) heating has been gaining immense popularity in the
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