ACU MATH Student Mannheim Slide Rule No. 500 Vintage Made in USA

Vintage slide rule, a Student Mannheim model by ACU MATH, identified as No. 500. This calculating instrument features scales and markings for various mathematical functions, including S, L, T, CI, B, K, A, and D. It is constructed with a sliding central component and is marked as "Made in U.S.A.". The reverse side features a table of decimal equivalents. Keywords: slide rule, acu math, student mannheim, vintage, collectible, mathematical instrument, engineering tool, no 500, made in usa, decimal equivalents, scientific instrument, analog computer, retro math, antique slide rule