Type 94 37mm anti-tank gun at Royal Armouries at Fort Nelson, Hampshire, England. The Type 94 37 mm anti-tank gun was an anti-tank gun developed by the Imperial Japanese Army and used in combat during the Second Sino-Japanese War and World War II. The Type 94’s number was designated for the year the gun was accepted, 2594 in the Japanese imperial year calendar, or 1934 in the Gregorian calendar. The Type 94 37-mm AT gun was introduced in 1936. The design originated as an improvement to the Type 11 37 mm infantry gun, which was also used as a primitive anti-tank weapon. However, its short bore, low muzzle velocity, short range and slow reloading time gave it a limited capacity against enemy armor. Development of a replacement began in July 1933 and was completed a year later. Initial testing indicated that a trained crew could fire up to 30 rounds per minute; however, Army planners felt that the initial design was too heavy. A modified design was tested in 1935, and actual productio...