Concise Circular slide rule 28 English Version, made in Japan 1968 Instrument The shiny and reflective surface

The shiny and reflective surface of the server (available in chrome or copper-plated steel) creates a contrast between the cover’s knob and the vessel’s handles

defying what most would think of from this "portrait" lens

not flicking a switch

High Blend Multiplex filter switch lets you reduce high-frequency noise on FM stereo broadcasts

Concise Circular slide rule 28 English Version, made in Japan 1968 Instrument The shiny and reflective surfaceMy Dad gave me this when I was in H. S. in 1968, I never used it (and neither, I doubt, will you) I've owned this for 58 years, so I'm listing it as USED however its in as new condition with its original manual and packaging sleeve. English specifications for Slide Rule No. 27 This is the most popular circular slide rule, and it is a basic slide rule that can easily perform calculations other than addition and subtraction, such as multiplication,