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IS-7

The development of the IS-7 started in the Spring of 1945. Prototypes were in trials during 1946 and 1947. By 1948, the IS-7 heavy tank was developed. The IS-7 model 1948 variant had a weight of 68 metric tons and was armed with the 130 mm S-70 naval cannon (7020 mm long barrel) with autoloader and stabilizer, infrared night scopes, 8 machine guns, armor from 220 to 300 mm thickness', and 60 km/h roadspeed.
Only three were built and it was the largest tank ever produced by the USSR. Although it was in many ways an innovative design, it was never accepted for mass production due to its cumbersome size and the very impractical layout of its fighting compartment. The tank housed a crew of five.