In 1936, they started using high grade PVC (Astralon / Aristopal) and adopted the product name ARISTO. Production continued until they closed in 1978. This item is an ARISTO STUDIO (model 0968), never used before , since it was practically forgotten for decades (together with other slide rules) in the storage room of a drafting equipment shop.It is therefore as new except one or two stains due to its age! Shown in the blown-up photos in its original box (itself in very good condition) and its case is also as new. The case contains, beyond the slide rule, a plastic ruler printed with formulas, constants, conversion into Anglo-Saxon units etc. Moreover, the box contains beyond the case with the slide rule and the ruler, a booklet with the instructions for use and a plastic bag containing two plastic clip-on supports that serve to maintain the slide rule inclined towards the user. Considering its almost impeccable, very good condition, this slide rule is a collection item, eventually for a technology museum or a serious collector. The item "ARISTO-Studio Slide Rule" is in sale since Wednesday, February 28, 2018. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules". The seller is "andros20156944" and is located in Philothei. This item can be shipped worldwide.