The T-44 is a first-generation medium tank first produced near the end of the World War II by the Soviet Union, and is the successor to the T-34. Fewer than two thousand T-44s were built, but the design became the basis for the T-54/55 series of main battle tanks, the most-produced tank of all time.

Read more about T-44:  Description, Production History, Service History, Variants

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T-44 - Variants
... T-44-85 (1944) – Designation for two first generation prototypes armed with 85 mm D-5T tank gun and two second generation prototypes armed with 85 mm ZiS-S-53 tank gun ... T-44S (1966) – T-44A fitted with "Cyclone" two-plane gun stabilization system ... T-44 tanks converted into fixed fortifications ...