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.

Plus 512
Anita 831
Anita 1011 LSI
Anita Mk VII

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 29th December 2013                  Update information.

 

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Text & photographs copyright © 2002 - 2013 Nigel Tout, except where noted otherwise.