Notes: "The K&E 4181-1 slide rule is the all-plastic, pocket-size version of the ubiquitous 10-inch 4081-3 Log Log Duplex Decitrig, with the exact same set of scales and scale arrangement. It’s a little bit chunky for a pocket slide rule, but about the same size as the Post 1461 Pocket Versalog or Ricoh 551 (also sold as the SIC 5510 and Lafayette 99-7099 Decima Log). "
