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KV-3 tanks with 120mm frontal armor, 90 mm of side protection, this comprehensive protection evenmore powerful than nearly a year later the German Tiger tanks. Designrequirements to improve the artillery power, so KV-3 selected Navy B-34 type107 mm gun, and to improve to become the ZIS-6-type gun, the gun's muzzlevelocity of 800 meters per Second, firing armor-piercing time, UBR -420 typepenetrator weighs nearly 19 kilograms, can penetrate 167 mm of armor at 500meters. To improve the shooting angle, the gun in the turret angled shot noless than 30 degrees, while 92 factories and GKO factory started to design the transfor mation model, and after the completion of the transfer to the Kirovplant, and require the production of 500 in 42 years carrying 107 guns KV-3tanks.
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