 In 1941 Zuse started a company, "Zuse Apparatebau" (Zuse Apparatus Construction), to manufacture his machines, renting a workshop on the opposite side in Methfesselstraße 7 and stretching through the block to Belle-Alliance Straße 29 (renamed and renumbered as Mehringdamm 84 in 1947).In 1941, he improved on the basic Z2 machine, and built the Z3.On 12 May 1941 Zuse presented the Z3, built in his workshop, to the public.