EntityQ7860736· pop 7· linked from 62 articlesType 4 rocket launcherSign in to save20 cm rocket launcherConnections8 cm/40 3rd Year Type gunEntityUnited StatesCountryJapanCountryWorld War IIConceptInternational Standard Book NumberEntitycannonEntityEmpire of JapanEntityTNTEntityhowitzerEntitycalibreEntitymortarEntityJapanese archipelagoEntitygun barrelEntityImperial Japanese ArmyEntityImperial Japanese NavyEntitygrenade launcherEntityYasukuni ShrineEntityVenturi effectEntitymuzzle velocityEntityOperation DownfallEntityCategories203 mm artilleryRocket artilleryWeapons and ammunition introduced in 1943World War II artillery of Japan