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Oiva Emil Kalervo Tuominen (March 5, 1908, Iitti - January 28, 1976, Helsinki) was a Finnish fighter ace and a Mannerheim Cross knight of the second class. He flew over 400 flights and shot down 44 Soviet aircraft. He was the most successful Finnish biplane fighter ace (flying Gloster Gladiators), and also the most successful Finnish Fiat G.50 pilot.