The design was deemed to offer no significant advantages over the IS-2, just the reload time was less, and the IS-6 project was halted. The alternative Object 252 shared the same hull and turret as the Object 253, but used a different suspension with no return rollers, and a conventional mechanical transmission. The experimental transmission proved unreliable and was dangerously prone to overheating, and development was discontinued. Similar systems had been tested previously in France and the United States and had been used with limited success in the German Elefant/Ferdinand tank destroyer during World War II. There existed two different IS-6s: the Object 253 was an attempt to develop a practical electrical transmission system for heavy tanks. The IS-5, is merely one of the many designations given to what would ultimately become the T-10 tank. German general Hasso von Manteuffel, who met tanks of that series in combat for the first time in Rumania in 1944, considered the Stalin tank "the finest in the world." Object 703 IS-3 By the end of World War II, 3,854 IS-2 model 1943 and model 1944's combined were produced. Production in bulk of the IS series started in February 1944 and ended nearing the end of World War II. The first few KV-85 tanks were produced in 1943 as a stopgap while the IS-1's development cycle was wrapped up. The 1944 model was produced with a revised front slope that was better from an armor point of view while still saving weight. The IS-122 was renamed to IS-2 and production started with the 1943 model using a KV-13 chassis. The IS-122 was found to be better in trials, and the IS-100 was dropped. In December 1943, the IS-85 was up gunned with the 100mm BS-3 gun, creating the IS-100, and the IS-122, armed with the A19 gun (later adopted and renamed as the D-25T). The IS-85 was soon finished and it combined the hull of the KV-13, and the new turret from the KV-85, and the same D-5T gun as both tanks. The tank was a result of the USSR's tank design bureau being torn in two, one half focusing on the KV-85 and its variants, and the other working on the later IS series. The KV-85 heavy tank was a modification of the KV-1S heavy tank.
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