The 85 mm air defense gun M1939 (52-K) ( ) http://www.armyrecognition.com/russia_russian_army_light_heavy_weapons_uk/ks-12_ks-12a_85mm_m1939_m1944_anti-aircraft_gun_cannon_technical_data_sheet_specifications_pictures.html was an 85 mm Soviet anti-aircraft gun, developed under guidance of leading Soviet designers M. N. Loginov and G. D. Dorokhin.