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A prototype AFV, also designated U-13, that had two 45mm cannons flanking the central 76.2mm cannon. The intent of this vehicle is unknown, and only one further development, the KV-7-2, or U-14, was made. Neither prototype survives, as far as I know. However, U-14 was eventually developed into the well-known self-propelled gun and ersatz tank destroyer SU-152.