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Domestic microwave ovens first became widely available in 1967 in the United States. Until then they had mainly been used in restaurants or vending machines. Dr John Osepchuk, an engineer and expert in microwave technology spoke to Cagil Kasapoglu about the innovation.

Photo: A Londoner demonstrates how to use a new vending machine with frozen meals and a microwave oven for heating. Credit: Jim Gray/Keystone/Getty Images