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How is a Microwave Built? Microwave ovens have brought household convenience to a whole new level. They are designed to fit inside wall cabinets or on top of kitchen islands. They are constructed of various materials. In 1940 the cavity magnetron tube emitting microwaves was invented at Birmingham University in England. Percy Spencer realized that this device could be used to heat food when he watched corn pop and eggs cook. Raw Materials Microwave (MW) heating has been gaining immense popularit
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