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1943, the face of the Germans more and more thick fortifications in defensive operations, the Soviet early small-caliber light howitzers powerful.After November 1943, authorized by the Revolution ary Committee of the Soviet Union the Ge Labin Central Artillery Design Bureau started to design thenext generation of self-propelled guns, the KV-1S chassis and B-4 howitzer combination of design, named S-51 self-propelled artillery, optimizeartillery combat combat readiness to complete the 20 minutes. In addition, due to the stron g chassis of the KV-1S tank, the S-51 artillery can be folded totherear to reduce the bodywork length to facilitate themarch. S-51 inearly 1944 by nearly 300 design test and a series of wild march test, basically reached therequirements, Soviet firepower summarized as, machine power in artillery belonging to excellent. 43 years after the SU-152, ISU-152 type of either anti-tank and fire support, or the emergence of closed fighting compartment fighting vehicles, as well as expensive howitzer B-4, S-51 gradually disappear in a the Sample car.
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