Notes: "The Aristo 0903 was an exceptionally popular student slide rule, and over its lifetime it was made in at least 14 different variants. Some variations were small (the color of the ink for the ARISTO logo), and some were large, to the point of having almost a completely different scale set. Some collectors attempt to find all the variants. I hope this one ticks off a box for someone out there. This is one of the variants with log log scales. The scales are identical to the model that Charvoz supplied to the Capital Radio Engineering Institute. "
