Bell Punch Company & Anita Calculators

Bell Punch Company and the
ANITA calculators

This is a brief history of the Bell Punch Company and the development of the ANITA calculator, the world's first desktop electronic calculator, and its successors.

Associated companies of Bell Punch Co. Ltd. mentioned here include Control Systems Ltd.; British Computator Corporation Ltd.; Plus; Sumlock Comptometer Ltd.; Sumlock Anita Ltd.

Contents

Introduction and Acknowledgments

Part 1 - The Bell Punch Company & the Development of the Anita Calculator

	1.	The Origins of Bell Punch Company
	2.	Mechanical Calculator Days
	3.	National Calculating Service and Sumlock Comptometer Colleges
	4.	The development of ANITA - the World's First Desktop Electronic Calculator - Part 1
	5.	The development of ANITA - the World's First Desktop Electronic Calculator - Part 2
	6.	ANITA is launched
	7.	At Work with ANITA
	8.	All Change at Bell Punch
	9.	ANITA Developed Further
	10.	ANITA at its Zenith
	11.	Sourcing from other Companies
	12.	The Rockwell Connection
	13.	The Demise of ANITA and Bell Punch
	14.	Reminiscences

Part 2 - The Calculators in detail

	15.	Plus, Sumlock, and Sumlock-Comptometer Mechanical Calculators
	16.	Early ANITA Electronic Desktop Calculators
	17.	ANITA Electronic Desktop Calculators using both Transistor Logic and Integrated Circuits
	18.	The first ANITA Electronic Desk Calculators using LSI integrated circuits
	19.	ANITA Electronic Hand-held Calculators
	20.	Models Derived from ANITA Electronic Hand-held Calculators.
	21.	Rockwell-ANITA Desktop & Hand-held Calculators
	22.	Calculators made by other Companies
	23.	Sales Literature - Sales Brochures & Advertisements
	24.	Operating Manuals & Related Materials
	25.	Review of ANITA Mk 8

Part 3 - Appendix

	26.	Company Structure
	27.	A Tour of Company Sites
	28.	Summary
	29.	The Technology Explained
	30.	Operating a "Comptometer"
	31.	The old Sterling currency, £sd.
	32.	Links to other sites
	33.	Update Information

Note that this is a virtual calculator museum which only exists as photographs and text on this website, not as a physical display of calculators anywhere.
None of the calculators displayed is for sale.

Disclaimer: The information on this site is presented in good faith. While we make great efforts to list accurate details we take no responsibility for any consequences for errors that may unintentionally be present. Note that information presented may also be updated as further detail becomes available.

This site is updated as new information and photographs become available.

If you have further information about Bell Punch and its calculators that you can pass on please get in touch. Any corrections or clarifications are also very welcome.

The Vintage Calculator Web Museum is always interested in acquiring Anita calculators that are not in the collection, and also calculator operating manuals, service manuals, teaching manuals, books, catalogues, and brochures.
If you have anything that you are willing to donate, copy (cost of copying will be refunded), or sell please contact me.

Last significant update 25th January 2019 Update information.

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