A Lab Counter by the Denominator Company
Channel: Jaap Scherphuis
Date: 27/04/2017

This lab counter was made by the Denominator Company in around 1948. The company still exists today and makes various counters including a modern version of this lab counter.

To see my collection of Mechanical Calculators, please visit my website:
https://www.jaapsch.net/mechcalc/