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Although the SU-152 was successful in combat, production of the KV-1S tank chassis was ending, which made the modernisation of the vehicle necessary, using the new [[Iosef Stalin tank|IS]] tank chassis. On 25 May 1943 the administration of Factory No. 100 ordered the modernisation of the SU-152, which included increased armour protection and other improvements. Development began in July 1943, under the supervision of [[Josef Kotin]], the chief designer of Soviet heavy tanks, and G. N. Moskvin as the main designer.
The new design, designated '''IS-152''' (''ИС''-152), was tested from September to November 1943. Testing revealed a large number of deficiencies, which sent it back for further improvement. On 6 November 1943 an order was issued for adoption of the improved variant, under the
==Design==
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