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How is a Microwave Built? Microwave ovens have brought home convenience to a completely new level. They can be positioned in the wall cabinets or on the top of kitchen islands. They are constructed of a variety materials. The cavity magnetron tube emitting microwaves was invented in 1940 at Birmingham University in England. Percy Spencer discovered that this device can cook food after watching corn pop, and eggs cook. Raw Materials Microwave (MW) heating is growing in popularity in the indus
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