Acu-Rule, Acu-Math 90A, c.1945
Serial Number or Date Stamp:
|Country: USA||Primary construction material: Mg||Case included?: yes|
General Description: Basic linear polyphase duplex slide rule
Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.
Front Scales: T DF [ CF CIF CI C ] D S ST
Back Scales: A [ B K L C ]
Notes: St. Louis, Mo., USA; Mannheim Trig; dimpled slide; special leather case; Acu Design pat. pending; owner R.W. Shutt, Tower City, Pa.
Date Acquired: 09/13/2021