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How is a Microwave Built? Microwaves have taken convenience for the home to a new level. They are designed to fit inside cabinets on the walls or over kitchen islands. They are also made from a variety of materials. In 1940 the cavity magnetron tube emitting microwaves was created at Birmingham University in England. Percy Spencer discovered that this device could heat food after he watched eggs pop and corn cook. Raw Materials Microwave (MW) heating is gaining a lot of attention in the field of material p
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