Three-inch A.A. cartridge cases. Cartridge cases for three-inch antiaircraft shells go through the first drawing operation. A brass cup formed from flat disc is fed to a huge press which draws it into a tubular shape with one rounded closed end. Washing and annealing precedes the first draw and will follow it. Washing cleanses surfaces for future operations. Annealing removes strains set in the metal by the forming and drawing operations