 Among other artillery design bureaus joining the program were the design bureau of the ""Krasniy Putilovets"" plant (L-1 and L-2 universal guns), the design bureau of the no.8 plant (semi-universal guns 25K, 31K and 32K) and GKB-38 (universal A-52 and semi-universal A-51).GKB-38 was closed in 1933, and V. G. Grabin, the leading developer of the team that was working on the A-51 project - became the head of a design bureau of the new Novoye Sormovo (no.