The BT-7 was the last of the
BT tank series of
Soviet cavalry tanks that were produced in large numbers between 1935 and 1940. They were lightly armoured, but reasonably well-armed for their time, and had much better mobility than other contemporary tank designs. The
BT tanks were known by the nickname Betka from the
acronym, or its diminutive Betushka.
[2]The successor of the BT-7 Tank would be the famous
T-34 medium tank, introduced in 1940, which would replace all of the Soviet fast tanks,
infantry tanks, and medium tanks then in service.
http://2daydesign.ru/project/3d-model-tanka-bt-7/ 
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