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How is a Microwave Built? Microwave ovens have taken household convenience to a whole new level. They can be positioned in wall cabinets or on top of kitchen islands. They are constructed of a variety 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 field of material p