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How is a Microwave Built? Microwaves have taken household convenience to an entirely new level. They can be positioned in the wall cabinets or on the top of kitchen islands. They are constructed 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 heat food as he watched corn pop and eggs cook. Raw Materials Microwave (MW) heating has gained immense trac
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