Heavy tank
The Char 2C was one of the largest tanks ever produced. At the start of World War II, France and the Soviet Union were the only countries to have inventories of heavy tanks, such as the Char B1, T-35, and KV-1. The Matilda II was designed under the British infantry tank concept which is similar to the heavy tank having thick armor and weighing more than their other tanks. It’s usually separate because they have less firepower with their cruiser tanks (comparable to mediums) at the time having the same main armament but more machine guns. Later war examples were the German Tiger I and II, as well as the Soviet IS series. Note that "heavy" versus "medium" is more a question of tactical roles than weight; the Panther, for example, was a "medium" tank that outweighed most Allied "heavy" tanks.
Tanks of the interwar period
The Type 89 Chi-Ro tank was lighter (9.8 tonnes) and shorter than the Chi-I. It contained increased armour (6 to 17 mm) and an improved water-cooled engine. After success in initial tests, the Type 89 became the first mass-produced Japanese tank. The Type 89 had a crew of four, and was armed with a 57 mm Type 90 gun and two 6.5 mm type 91 machine guns. The second version of this tank known as the Type89B Otsu used a diesel engine. The Japanese were among the first to use diesel engines in their tank designs.
During the 1930s, the Japanese began production of tankettes and light tanks, which were used heavily in Manchuria and China. The Type 94 tankette weighed 3.4 tonnes and was generally used as either a tractor to tow an ammunition trailer, or as a patrol/reconnaissance tank. With a crew of two men and a single 6.5 mm type 91 machine gun, 823 units of the Type 94 were produced and they saw widespread service as late as 1945. Over twice as large as the Type 94 at (7.4 tonnes), the Type 95 Ha-Go light tank had a complement of three crewmen, a 37 mm gun and the same 6.5 mm type 91 machine gun, and most importantly a diesel engine which would later greatly influence future tank designs in the Soviet Army. Over two-thousand Type 95 tanks were built, and production continued until 1943.