"Type 4 20 mm Twin AA Machine Cannon"@en . . . "Type 4 20 mm Twin AA Machine Cannon was a Japanese Anti-aircraft gun. It consisted of two Type 98 20 mm guns. It was introduced in 1944 and approximately 500 guns were produced. \n* Caliber: 20 mm \n* Barrel length: 1.4 m (L70) \n* Muzzle velocity: 950 m/s \n* Range: 5,500 mm \n* Altitude: 3,500 m \n* Rate of fire: 600 round/min"@en . . . "Type 4 20 mm Twin AA Machine Cannon was a Japanese Anti-aircraft gun. It consisted of two Type 98 20 mm guns. It was introduced in 1944 and approximately 500 guns were produced. \n* Caliber: 20 mm \n* Barrel length: 1.4 m (L70) \n* Muzzle velocity: 950 m/s \n* Range: 5,500 mm \n* Altitude: 3,500 m \n* Rate of fire: 600 round/min"@en . . . .