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How is a Microwave Built? Microwave ovens have brought home convenience to a whole new level. They can be put in wall cabinets or on the top of kitchen islands. They are also manufactured with a variety of 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 observed eggs and corn pop cook. Raw Materials Microwave (MW) heating has bee