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VACUUM TANKS FOR WILLOW RUN WIND TUNNEL: These oil car tanks, converted from supplies intended for the USSR during the war, are pumped free of air to create the vacuum which draws air through the University of Michigan's supersonic wind tunnel at the Willow Run Laboratories. The air, which technicians hope to get up to speeds of 7,000 miles per hour, takes only 15 seconds to pass through the tunnel-- and two and one-half hours to be pumped back to the supply balloon.
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