Northrop N-23 Pioneer (US, 1946) Northrop C-125 Raider (US, 1949) NVI F.K.33 (Netherlands, 1925) Oeffag G6 (aka Pola 'G') (Austria-Hungary, 1916)[48] Ogden Osprey (US, 1930)[49] P.Z.L. 27 (Poland, 1934) P.Z.L. 4 (Poland, 1932) Pander S-4 Postjäger (Netherlands, 1933) Piaggio P.16 (Italy, 1934) Piaggio P.23R (Italy, 1936) Piper PA-32-3M prototype (US, 1966) Potez X (France, 1922) Potez 40 (France, 1930)[50] Prudden TM-1 (US, 1928)[51] Prudden-Whitehead monoplane (US, 1930) Renard R.30 (Belgium, 1931) Renard R.35 (Belgium, 1935)