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How is a Microwave Built? Microwaves have taken household convenience to a whole new level. They are designed to fit inside wall cabinets or on top of kitchen islands. They are constructed from a variety of materials. The cavity magnetron tube that emits microwaves was invented in 1940 at Birmingham University in England. Percy Spencer discovered that this device can cook food after watching corn pop, and eggs cook. Raw Materials Microwave (MW) heating has been gaining immens
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