Graphoplex Combustion Babcock Wilcox circular slide rule full set 1952 France

This is a large Combustion circular slide rule in the original case, complete with the original 1952 manual. All in the French language, made in France by Graphoplex for the American Babcock & Wilcox Company in cooperation with the Professors Bernon and Dumex from the French Society of Constructions. It is a very interesting combination of a small slide rule with cursor, fixed to the centre of a circular slide rule, combined with a graphical interface in 2 colors (red and dark blue). All parts are made of plastic, the box is made of cardboard. Everything is complete and working  and everything is in very good, condition as well. There are some signs of use and age, specially to the box and manual but the slide rule is in great condition. The slide rules measures ca. 25 cm or 10 inches in diameter. Do check the attached video on how to work your vintage man tool: slide rule operation instructions!