Millionaire Calculating Machine with Stand

In 1895, Otto Steiger, a Swiss citizen residing in Munich, obtained a U.S. patent for a calculating machine that would multiply a number by a single digit directly, with only a single turn of a crank. Earlier calculating machines required considerably more effort.

John Wolff's Web Museum - Millionaire Register

John Wolff's Web Museum - Millionaire Register

Mechanical calculator - Wikipedia

Millionaire Calculator Machine Explained - Everything You Need To Know - History-Computer

Calculating in olden times

Millionaire Calculating Machine with Stand

the Millionaire Calculator, Hans W

Millionaire mechanical calculator, B161.81A

Mechanical calculator - Wikipedia

John Wolff's Web Museum - Millionaire Register

Nicola Marras: mechanical calculator and adding machine

Millionaire mechanical calculator, B161.81A

Inside the Denver Mint: Millionaire