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How is a Microwave Built? Microwaves have elevated the convenience of home to a whole new level. They can be placed in cabinets for wall use or on top of kitchen islands. They are also manufactured using a variety of different materials. In 1940 the cavity magnetron tube emitting microwaves was created at Birmingham University in England. Percy Spencer realized that this device could heat food as he watched eggs pop and corn cook. Raw Materials Micro