Notes: "The K&E 4097 series of slide rules were all very thin, white “Xylonite” plastic slide rules. The “B” model (there were also C and D versions) was the simplest of the three, with all the scales on the front of the rule and slide. Those scales, DF | CF, CI, C | D, are the same as the scales on the 4094 Merchant’s Slide Rule, possibly indicating the target market for this slide rule. It is all about multiplying and dividing, nothing else. "
