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Engineers check body revolution model, Ohio, USA, July 31, 1957. Engineers at the Lewis Flight Propulsion Laboratory making a check on the body of a model of a supersonic aircraft before a test run in the 10ft x 10ft Supersonic Wind Tunnel test section. Engineers check body revolution model, Ohio, USA, July 31, 1957. Creator: Unknown. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)