The T-22 (or Tank Grotte / TG / TG-1) is a medium tank with a multiple turrets developed in the late interwar period by Edward Grotte and his team of engineers. The prototype was presented to the OKMO with a different engine, as the one planned was not available at the time. Early tests asked for 50 pre-production models, followed by 2000 specimens with mass production starting in 1932. But as the tests progressed the T-22 was deemed unsuitable for mass production as the technology was too experimental, the design was maintained until August 1933 until Edward Grotte was requested to leave Russia. The knowledge gained from developing the T-22 went on to prove useful in later Soviet tank models.