This specification covers one type of A i r Defense WeaponSystem which consists of an electrically powered, six-barrel, 20 m i l l i -meter(mm) gun with linked feed and amunition system, radar range, lead
computfng sight and fire control system mounted on a towed, two wheelvehicle. The ~ 1 6 7 t~ow1e d, XIMM, A i r Defense Artillery Gun is hereafter referred to as the weapon system.