Although many adding machines were made by Friden, this is their only four-function printing calculator. While Monroe and Marchant supplemented their line of calculators with rebadged European machines, Friden designed and produced all their machines in house. It was not introduced until 1967, the final years for mechanical calculators. This is a very large machine, styled to match the R-line rotary calculators. The ten-key number entry uses the same mechanical display as the rotary calculators to show the number before entry. Although a memory is claimed for the machine, it only allows direct access to the control register, so it would be useless for any memory problems with require intermediate multiplication.

My sincere thanks to Jake and Joel Jacobs for the donation of this machine