The story
Kazan Helicopter plant was founded on September 4, 1940. It launched production of Mi-1 helicopters in 1951; it was the first serial production of helicopters in USSR. The plant has produced the first national exported helicopter – Mi-4, and the most popular helicopter – Mi-8. The total flight time of helicopters made by Kazan Helicopters exceeds 50 million hours. Kazan Helicopters has delivered over 12000 Mi-4, Mi-8, Mi-24, Mi-17, Ansat helicopters (and their modifications) to 100 countries of the world.
From Wikipedia’s article on Kazan Helicopters, shared under CC BY-SA 4.0.3