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.

National Museum of American History

, 1. Equipped with 6 Inch writing tablet, you can take notes or graph while calculating by using the stylus pen in the bottom left side., 2. Solar

Calculator 12-Digit Display Desk Calcultors Solar Dual Pocket Calculator + Erasable Writing Table Gray

Portable Student Scientific Calculator 2 Line Display 82MS-A

George Lindsay's Royal Microscope

A Calculator, PDF, Calculator

National Museum of American History

Calculator - Wikipedia

🖩 Pocket Calculator Emoji

A Calculator, PDF, Calculator

Who invented the electronic calculator? - Quora

What is a calculator?

A Brief History of Calculating Devices