EntityQ3912769· pop 5· linked from 51 articlesOJSign in to save1931 observation floatplane series by Berliner-JoyceConnectionsUnited StatesCountryWorld War IIConceptInternational Standard Book NumberEntityBoeingEntityInternational Standard Serial NumberEntityUnited States NavyEntityseaplaneEntitybiplaneEntityundercarriageEntityDouglasEntityCessnaEntityNational Advisory Committee for AeronauticsEntityradial engineEntityGrummanEntityGlenn L. Martin CompanyEntityCurtiss-WrightEntityCessna O-1 Bird DogEntityAirco DH.4EntityVoughtEntityaerospace manufacturerEntityCategories1930s United States military reconnaissance aircraftAircraft first flown in 1931Berliner-Joyce aircraftBiplanesFloatplanesSingle-engined tractor aircraft