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How is a Microwave Built? Microwaves have taken convenience for the home to a new level. They can be put in the wall cabinets or on the top of kitchen islands. They are also manufactured with a variety of materials. The cavity magnetron tube that emits microwaves was first developed in 1940 at Birmingham University in England. Percy Spencer discovered that this device can cook food after watching the corn pop and eggs cook. Raw Materials Microwave (MW), heating is gr
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