4x Aristo 0968 slide rule versions with acces 1950-1970 Germany

Here we have 4 different version of this very popular model 0968, which was the standard for many students in Germany. This slide rules was produced by Dennert & Pape, called the Aristo Studio model. It is very versatile and double sided as well as quality build. I offer here 4 versions through time that have have slightly different builds as well as one with a magnifier cursor. In addition it comes with an example of most (if not all) the accessoires they came with like cases, complete box, sheets and xtra legs, making this an interesting bunch. These are all stand sized slide rules, measuring about 32,5 cm or 13 inches. All are in good to very good condition with only sign of normal use and age. Price is for all 4 together.