sentences:  After "Nomonhan", new tank guns were developed for the Chi-Ha with a calibre of 47 mm - less than 57 mm tank gun - but having a longer barrel, and better penetration than the Type 97 gun.From 1942 onwards, the Type 97 tanks were armed with the high velocity Type 1 47 mm tank gun in a new larger turret, and were designated the Type 97-Kai Shinhoto Chi-Ha.The Type 97 57 mm tank gun had the following specifications