"CASTELL" Addiator DRP 1/87A slide rule and case
in box: 3/4 in x 12 1/2 in x 2 in; overall: 3/4 in x 12 in x 1 3/4 in
This slide rule also has a little addometer calculator on the back. There is a stylus for the addometer contained in a hole in one end of the slide rule.
Pre-computer: slide rule
Gift of Joseph Santangelo