VEB Mantissa Electric slide rule full set 1974 GDR Germany

This double sided full plastic slide rule comes in its original grey cardboard box and with German manual. It is a model for electric engineers and is very elaborated with scales on both sides. Rule, manual and case are marked with model and company name. It was made by VEB Mantissa from the GDR/DDR (Eastern Germany) in 1974 (according to the manual). It has a standard body with simple cursor and it measures ca 33 cm or 13 inches. It is in overal good condition but has clear signs of use and age (mostly yellowing). The manual has signs of use as well. Do check the attached video on how to work your vintage man tool : slide rule operation instructions!