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How is a Microwave Built? Microwave ovens have brought household convenience to a new level. They can be positioned in wall cabinets or on the top of kitchen islands. They are also manufactured 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 can heat food after he watched corn pop, and eggs cook. Raw Materials Microwave (MW) heating is gaining a lot of attent
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