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.

: Office Products

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

Magic Brain: Last Gasp of the Mechanical Calculator

Handheld Electronic Calculators

Calculator - Wikipedia

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

THE CALCULATOR REFERENCE

First handheld calculator headlines auction of mathematical treasures

Hewlett Packard 21 Old computers, Calculator, Pocket calculators

La malle d'Epopy

Slide Rule Terms, Glossary and Encyclopedia

What is a calculator?

Pocket Programming

Things that Count

The Pocket Calculator Race

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