Bureau Osobikh Konstruktsii, bureau of special designers, set up October 1930 on initiative of P.I. Baranov as part of CAHI. BOK-1 pressure-cabin high-altitude (1936), BOK-2 high-lift 2-part wing (1935), BOK-5 all-wing tailless (1937), BOK-7 high-altitude 100-hour endurance (1938), BOK-8 again BOK-1-based for armament control system, BOK-11 high-altitude diesel-engined reconnaissance (1940), BOK-15, BOK-11 development.