2x Norma Grafia 100 + 190 circular slide rules case Norma 1960 Germany

Here are 2 metal Norma Grafia slide rules, created for the “graphical industry”.  There is a large one, the 190 with a diameter of 19 cm or 7 3/4 inches and a small version, the 100 with a diameter of 10 cm or 4 inches. The Norma Company was started in 1959 so these slide rules are probably from the 1960’s. They are in overall good condition with short instructions on the front side of the sleeves. The larger one has a small piece missing around the screws on the outside of the cursor. The price is for both pieces together. I ams also selling an earlier Rieger Merkuria 190. Check the attached video on how to work your vintage man tool: circular slide rule operation instructions!