At the time of the company's registration, SAB had only eleven employees. Soon the number of employees rose to 100. From the beginning, Severin Ahlmann employed refugees and displaced persons from the former German eastern territories, and the Soviet occupation zone. They became a success factor for the young company.
The warehouse (factory building IV) at SAB. Concrete roof tiles can be seen on the right. For the British Rhine-Army and other British services, Carlshütte produced 42,000 stoves in 1945/46, 40,000 Canada stoves, 40,000 cookers, 100 large cookers, 3,500 bath tubs, 10,000 radiators, 5,000 washing kettles and also 50,000 aluminium roof tiles. Concrete was also used for roof tiles. This production was done on a large scale by SAB. Concrete roof tiles are an important product for SAB. Gerd Ostryga, who started at the Carlshütte on 17 November 1946, and shortly afterwards moved to the new Severin Ahlmann-Betonindustrie (SAB, later ACO), recounts in his memoirs that one of his first tasks was to form concrete roof tiles.