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How is a Microwave Built? Microwaves have taken household convenience to a new level. They are designed to fit inside wall cabinets or over kitchen islands. They are constructed 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 the corn pop and eggs cook. Raw Materials Microwave (MW), heating is growing in popularity in the industry
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