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The German Dornier DO-335 was unique in having a tractive (pulling) propeller in its nose and a propulsive (pushing) motor behind its cockpit, technology that at the time was totally new. It had a maximum sustained speed of 665 km/h (413 mph), increasing to 765 km/h (477 mph) with emergency boost. Two models existed (A-1 and A-6), the second one a a two-seater Nightfighter. Only 28 were completed before the end of WWII.