British Tabulating Machine Company
The British Tabulating Machine Company (BTM) was a firm which manufactured and sold Hollerith punched-card machines and other data-processing equipment. During World War II, BTM constructed a number of "bombes", machines used at Bletchley Park to break the German Enigma machine ciphers.
References
- John Harper, BTM — British Tabulating Machine Company Limited http://www.jharper.demon.co.uk/btm1.htm.
- John Keen, Harold 'Doc' Keen and the Bletchley Park Bombe, 2003, ISBN 0947712429.
- Martin Campbell-Kelly, ICL and the British computer industry, http://www.tech.port.ac.uk/staffweb/andersod/CCS/resurrectionarticle?Article=1-7.
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