Marcantoni 12,5 CA Concrete pocket full set slide rule 1960 Italy

This a pocket version concrete slide rule by Marcantoni from Milan in Italy. It has the number 12,5 on it with the addition CA for Cemento Armato or reinforced Concrete making it the 12,5 CA model. This slide rule is for calculation of reinforced concrete (per the system of Maarschalk I believe). It has a special scale in the middle on both sides of the slider for the different amounts of reinforcement. It has the original leather pouch (unsigned) that is complete but with loose stitches. It also comes with the original French instructions for is was produced for a French Company as can be seen on the back side where it is branded A.C.M. Jean Faure from the city of Firminy in the Loire region.It also comes with the original outer box that has the correct designation on front. It is all complete and in great condition. It measures ca. 15,5 cm or 6 1/4 inches. Do check the video below on how to work your vintage man tool : slide rule operation instructions!