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How is a Microwave Built? Microwave ovens have brought household convenience to a new level. They can be positioned in wall cabinets or on the top of kitchen islands. They are constructed from a variety of materials. The cavity magnetron tube that emits microwaves was first invented in 1940 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 is gaining a lot of attentio
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