sentences:  The To-Ku was large and heavy; it boasted extensive armor protection with 50 mm of armor plate in the front hull.The turret was a modified version of the one used on the Type 97 Shinhoto Chi-Ha medium tank that was fitted with a Type 1 25 mm gun and a rear facing Type 97 7.7 mm machine gun.The front hull mounted a Type 1 47 mm tank gun and a Type 97 7.7 mm machine gun.