Pocket Calculating Devices

While the 20th century saw grand designs for general-purpose computers, it also saw principles of precision engineering applied to earlier designs, allowing them to become portable.

pocket computer computer desk calculator finances keys figures

A Brief History of Calculating Devices

Charles Babbage's Difference Engine

Numbers in a can: the 'Curta' handheld calculator – Swiss National

: Office Products

Release 1Pc 10 Digits Display Pocket Electronic Calculating Calculator Office Supplies (White)

Calculadora – Wikipédia, a enciclopédia livre

La malle d'Epopy

Calculadora – Wikipédia, a enciclopédia livre

A Calculator, PDF, Calculator

The Aesthetics of Calculation

: Office Products

Release 1Pc 10 Digits Display Pocket Electronic Calculating Calculator Office Supplies (White)

The Pocket Calculator Race

Good Morning Yesterday: Slide Rule