50 Years Ago We Constructed the First Hungarian Tube Computer, the M-3: Short Stories from the History of the First Hungarian Computer (1957-1960) - History of Computing: Learning from the Past - page 77

Fig. 4. The logic units of the M-3 computer, (left) the new developed drum controller-unit, with
Hungarian produced long-life tubes, (right) the old unit, original Soviet design with Soviet
elements