The Type 69 (Chinese: 69式; pinyin: Liùjiǔ shì) and Type 79 (Chinese: 79式; pinyin: Qījiǔ shì) are Chinese second generation main battle tanks. Both were developments of the Type 59 medium tank (a locally produced Soviet T-54A) with technologies derived from T-62. They were the first indigenously developed main battle tanks by China, although also classified as medium tanks while in development and service. Their lineage from the T-54A can be seen through the distinct gap between the first and second road wheels. Other improvements included a new engine, ballistic computers, and laser rangefinders. The more advanced Type 79 variant was equipped with a 105 mm rifled gun which was also found on the Type 80 tank.