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How is a Microwave Built? Microwaves have taken household convenience to an entirely new level. They can be placed in the wall cabinets or on top of kitchen islands. They are also manufactured from a variety of materials. The cavity magnetron tube emitting microwaves was invented in 1940 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 gaining popularity in the m