Graphoplex 694a Tecnilog duplex slide rule full set 1960 France

This slide rule comes as a complete set with the red plastic container, manual and card, all made by Graphoplex from France. This model is the 694a Tecnilog Duplex with 21 scales of which a T>45 and T<45 scale. The rule itself is made of plastic, as well as the cursor. Curser and slide rule are complete and everything is in very good, hardly used condition, with some signs of use and age. The slide rules measures ca. 33 cm or 13 inches. Do check the attached video on how to work your vintage man tool : slide rule operation instructions!