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How is a Microwave Built? Microwave ovens have brought home convenience to a completely new level. They are designed to fit in wall cabinets or on top of kitchen islands. They are also made from a variety of materials. In 1940 the cavity magnetron device emitting microwaves was invented at Birmingham University in England. Percy Spencer realized that this device could be used to heat food when he observed eggs and corn pop cook. Raw Materials Microwave (MW) heating is growing in popularity
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