‘Produx’ Pocket calculator made in West Germany. This is the...
An Albert Nestler Rietz slide rule no. 20/1 with mahogany body,...
This is the earlier version of the Webb adder. It was patented...
This special type Planimeter was made in Germany by Robert Reiss...
Fowler & Co. in Manchester made this pocket calculator. It was...
Curta Type II Mechanical Calculator. This Type II model with serial...
Otis King Slide Rule Calculator Model 'K'. This is a cylindrical...
Willgodt T. Odhner invented the pinwheel calculating machines in...
This mint condition Type I model with serial number 47218 was manufactured...