Public domain
Production. Milling machines and machine castings. A new heat-treating furnace being installed in one of the country's leading machine tool plants. Heat-treating is one of the most important steps in the manufacture of sturdy, accurate moving metal parts, because a given piece of metal can be made e
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Credit lineProduction. Milling machines and machine castings. A new heat-treating furnace being installed in one of the country's leading machine tool plants. Heat-treating is one of the most important steps in . 1942-01-01. Palmer, Alfred T., United States. Office For Emergency Management. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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