Concise Circular slide rule 28 English Version, made in Japan 1968 Instrument very minor wear on wood

very minor wear on wood edges and some fading on the top of the brass

it works work great because it has no moving parts like fans

MPN:  jhsf1-ct 150-1Size: 150 FeetColor: BlackBrand: HEATITSuitable for use on plastic and metal water pipes

I at one time had top mounted brackets supporting them

Concise Circular slide rule 28 English Version, made in Japan 1968 Instrument very minor wear on woodMy 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,