Bell Punch Company
Also Anita, Sumlock-Anita, Sumlock-Comptometer.
The Island, Uxbridge, Middlesex, UK.
The story of Bell Punch Co. and its associate companies, Control Systems, Sumlock Comptometer, Sumlock Anita, and the development of the first electronic desktop calculators is very complicated and is covered in the article Anita: the world's first electronic desktop calculator: A brief history of the complex Bell Punch company and its calculators on this site, and a full history is given in the sister site to this one, "Bell Punch Company and the ANITA calculators".
Summary of the history of the Bell Punch Co., Sumlock, and Anita.
- 1878 - Bell Punch Co., Limited, was established in London as a manufacturer of ticket punches for buses and trams.
- July 1927 - Control Systems, Limited, was incorporated, as a holding company for the purpose of acquiring and consolidating the direction of the growing diverse activities of the Bell Punch Co.
- Late 1930s - Bell Punch introduces its first mechanical calculator, the Plus Adder, which resembles a cut-down "Comptometer".
- Early 1940s - London Computator, Limited, was incorporated to deal with the sales and distribution of the mechanical calculators manufactured by Bell Punch Co.
- December 1957 - Lamson Industries acquired a controlling interest in Control Systems, and so its subsidiaries.
- 1961 - Sumlock Comptometer Ltd formed from the amalgamation of the British operation of Comptometer Corporation of Chicago, U.S.A., with the calculator operation of Bell Punch Co.
- 1961 - The Anita Mk VII and the Anita Mk 8 were launched as the world's first electronic desktop calculators.
- 1966 - Sumlock Anita Electronics Ltd. was formed to take over the Bell Punch Co.'s former activities in the field of calculating machines. These were still distributed in Britain by Sumlock Comptometer Ltd.
- 1973 - Rockwell International of the U.S.A. buys Sumlock Anita Electronics from Lamson Industries. The Bell Punch Co. continues manufacturing and selling its other products, such as taximeters.
- About 1976 - Rockwell exits the calculator business. The rights to use the Sumlock Anita name were sold off and the name eventually disappears.
- About 1986 - The Bell Punch Co. was broken up.
Examples of Bell Punch and Anita calculators