Developed in the early 1940s to replace the obsolete T-26, but did not see mass production due to the beginning of WWII and the complex production process required. A total of 75 vehicles of different modifications were manufactured.
Time for the successive autoreloading of each shell into the magazine.
Characteristics are specified for Siege mode.
Characteristics are specified for Rapid mode.
Reload time of the first and second guns on double-barreled vehicles.
Characteristics are specified for vehicles with crews trained to 100%.