This slide rule has been specially constructed for Gaz de France by Graphoplex and comes with the original cardboard case and manual. It has a specific scales for gas related formulas and a beautiful cursor met multiple red hairlines. 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 good condition, with minimal signs of use and age. It measures ca 29 cm or 11 1/2 inches. Do check the attached video on how to work your vintage man tool: slide rule operation instructions!
