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How is a Microwave Built? Microwave ovens have taken household convenience to a whole new level. They can be put in cabinets for wall use or on top of kitchen islands. They are constructed of a variety materials. The cavity magnetron tube that emits microwaves was first developed in 1940 at Birmingham University in England. Percy Spencer realized that this device could heat food when he watched eggs pop and corn cook. Raw Materials Microwave (MW) heating has gained immense tractio
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