High Quality Content by WIKIPEDIA articles! The Type 4 Ke-Nu (?????, Yon-shiki keisensha?) was an innovation created to increase the number of light tanks available to front-line infantry divisions of the Imperial Japanese Army in World War II, through the re-use of obsolete components with little thought to quality or capabilities.The original version of the Type 97 Chi-Ha tank had been armed with a low muzzle velocity 57 mm tank gun. Operation experience in Manchukuo, China in the early stages of the Second Sino-Japanese War and against the Soviet Union at Nomonhan during the brief Japanese-Soviet Border War in 1939 revealed that this gun was totally inadequate against any form of opposing armor, and a new higher velocity 47 mm tank gun was developed. This was then installed in the Type 97 Chi-Ha medium tank to produce the Type 97-kai Shinhoto version, which became the standard main battle tank of the Japanese army. This left a large number of surplus Chi-ha turrets, which werelater retrofitted onto the chassis of the obsolete Type 95 Ha-Go light tank, which had been armed with a 37 mm tank gun. The result was designated the Type 4 Ke-Nu. In total, approximately 100 units were converted in 1944.