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

Part 2 - The Calculators in detail

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

Part 3 - Appendix

	23.	Company Information
	24.	A Tour of Company Sites
	25.	Summary
	26.	The Technology Explained
	27.	Operating a "Comptometer"
	28.	The old Sterling currency, £sd.
	29.	Links to other sites
	30.	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. 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 3rd January 2015 Update information. *Hints on navigating the site -* *The navigation bars are, in general, at the bottom of each page - Press the "End" key on your keyboard to go to there*

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	Text & photographs copyright © 2002 - 2015 Nigel Tout, except where noted otherwise.