1960s: KL-1 Russian Mechanical Circular Slide Rule and case.
Slide Rule Watch - Model KL-1’s Texnichesko-Cbetovaya Organizatsia “Rassvyet” Technical and Lights Company “Sunrise”
Pages linked to this page
This work by Jim Falk is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License Click on the logo to the left to see the terms on which you can use it.