Graphoplex Gaz de France pocket slide rule 1970 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 black design that makes the red on the cursor stand out. 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 are in great condition, the sleeve and manual are complete but show some signs of use age (small tear in manual top). 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!