Chart showing the relationship between the Bell Punch Company and its associated companies
Companies associated with Bell Punch Co.:
Bell Punch Co. Ltd. - Founded 1878, broken up 1986. The original company and the manufacturer of the mechanical and electronic calculators until 1966 when Sumlock Anita Electronics was split off.
Control Systems Ltd. - Founded 1927. Holding company for Bell Punch and its subsidiaries.
London Computator Ltd. - Founded 1940. Subsidiary, marketing company of the Plus and Sumlock mechanical calculators. Renamed to Sumlock Limited in 1950.
Sumlock Limited - Founded 1950 by renaming London Computator Ltd.
Lamson Industries - Bought Control Systems and its subsidiaries in 1957.
Bell Punch Export Co. Ltd. - Export sales subsidiary of Bell Punch Co.
Sumlock Comptometer Ltd. - Founded 1961. Subsidiary, incorporating Comptometer Ltd. for distributing Bell Punch calculators.
Sumlock Anita Electronics - Founded 1966, split off from Bell Punch Co.. Subsidiary, manufacturer of the electronic and mechanical calculators.
Sumlock Anita Ltd. - Renamed from Sumlock Comptometer Ltd. in 1974. Separate financially from Sumlock Anita Electronics, but the main UK distributor of its calculators, as well as those of other manufacturers.
Control Systems Ltd.:
The Island, Uxbridge, Middlesex.
Bell Punch Co.:
Headquarters and factory of Bell Punch Company, from 1922:
Bell Punch parts manufacture:
Research and development department for electronic calculators:
Administration Sumlock Anita Electronics and Sumlock Anita:
Electronic and mechanical calculator factory, opened in 1966:
Plastic mouldings and piece part factory of Sumlock Anita Electronics, opened in about 1973/4:
London Computator Ltd. which later became Sumlock Limited and then Sumlock Comptometer Ltd.:
London premises at:
Apsley, Hertfordshire - From about 1970 became the national training centre and a central servicing facility for the later electronic calculators.
Bell Punch Export Co. Ltd.:
39 St. James's Street, London S.W.1.
U.S. distributor of Plus adding machines:
Plus Computing Machines Inc., 5 Beekman St., New York 38, N.Y.
Advertisements of 1957 give the following addresses of the marketing companies of the Sumlock and Plus calculators:
"Two companies of the Bell Punch Group".
Text & photographs copyright © 2002 - 2013 Nigel Tout, except where noted otherwise.