Vintage Calculator Madas 20BZS Portable Calculating Machine Made by H. W. Egli in Switzerland c. 1950

Antique MADAS Calculator, 1913

Vintage Calculator Madas 20BZS Portable Calculating Machine

Madas 12 Calculating machines MADAS

Calculating Machine

Important MADAS Calculator in perfect working order. Year 1913.

Vintage Calculator Madas 20BZS Portable Calculating Machine Made

John Wolff's Web Museum - Hans W. Egli

Vintage Calculator Madas 20BZS Portable Calculating Machine

Mechanical calculators hi-res stock photography and images - Alamy

Facit Vintage Calculator Retro Mechanical Math Device - Finland

Vintage Mechanical Calculator

MADAS - Jaap's Mechanical Calculators Page

National Museum of American History

Calculating Machines