Mercury Mockup, St. Louis, MO
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Mercury Mockup, St. Louis, MO 
McDonnell KDD-1 Katydid assembly line in St. Louis, MO
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McDonnell KDD-1 Katydid assembly line in St. Louis, MO 
McDonnell Aircraft Corp. KDD-1 Katydid drone on workstand
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McDonnell Aircraft Corp. KDD-1 Katydid drone on workstand 
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