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How is a Microwave Built? Microwave ovens have brought home convenience to a new level. They can be placed in cabinets for wall use or on top of kitchen islands. They are also manufactured from a variety of 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 eggs pop and corn cook. Raw Materials Microwave (MW) heating is gaining a lot of atte
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