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PKZhelikopter indts eltt. hu PKZhelikopter Tervezte Petrczy Istvn Krmn Tdor Zurovecz Vilmos Az emellgcsavar megtervezst kivitelezst Asbth Oszkr vgezte niif hu pdf author PDHUunknown Helicopters of Hungary Oszkr Asboth Theodore von Krmn
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