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How is a Microwave Built? Microwaves have taken household convenience to a whole new level. They can be positioned in cabinets for wall use or on top of kitchen islands. They are made from a variety of materials. In , the cavity magnetron tube emitting microwaves was invented at Birmingham University in England. Percy Spencer discovered that this device can heat food after he watched eggs pop and corn cook. Raw Materials Microwave (MW), heating is growing in popularity in the industry of material processing due