The Type 59 (Chinese industrial designation: WZ120) main battle tank is a Chinese produced version of the Soviet T-54A tank, an improvement over the ubiquitous T-54/55. The first vehicles were produced in 1958 and it was accepted into service in 1959, with serial production beginning in 1963. Approximately 9,500 of the tanks were produced by the time production ended in 1980 with approximately 5,500 serving with the Chinese armed forces. The tank formed the backbone of the Chinese People's Liberation Army until early 2000s (decade) with an estimated 5,000 of the later Type 59-I and Type 59-II variants in service in 2002.