Jaap Scherphuis | The Schubert DRV mechanical calculator @jaapsch2 | Uploaded July 2021 | Updated October 2024, 5 minutes ago.
The Schubert DRV is a very well-designed pinwheel calculator. It was in production from 1952 till the 1970s. The controls are set up so that they can be used with one hand, and designed to need minimal effort. It was designed by Emil Schubert, who had previously co-founded and run Thales.

For more information on this calculator and other machines in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:20 Addition
0:46 Multiplication, shifting the carriage
2:11 Clearing
4:34 Back Transfer
5:25 Serial number
5:59 History, Emil Schubert
8:03 Models
9:29 Outro