Graphoplex Gas de France pocket slide rule 1960 France

This slide rule has been specially constructed for Gaz de France by Graphoplex and comes with the original sleeve and manual. It has a distinct blue and black design to match the company logo rather than the usual red and black design. The front has scales for calculating gasses and their combustion yield. For this a beautiful cursor was designed and the back shows the instructions in short as well as additional information. The interesting dedicated curser, rule and sleeve and manual are complete and in very good condition, with minimal signs of use and age. It measures ca 19 cm or 11 1/2 inches. Do check the attached video on how to work your vintage man tool: slide rule operation instructions!