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- British_Tabulating_Machine_Company abstract "The British Tabulating Machine Company (BTM) was a firm which manufactured and sold Hollerith unit record equipment 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.The company was formed in 1902 as The Tabulator Limited, after Robert Porter obtained the rights to sell Herman Hollerith's patented machines from the US Tabulating Machine Company (later to become IBM). By 1909, the company had been renamed the \"British Tabulating Machine Company Limited\". In 1920, the company moved from London to Letchworth, Hertfordshire; it was also at this point that it started manufacturing its own machines, rather than simply reselling Hollerith equipment. Annual revenues were £6K in 1915, £122K in 1925, and £170K in 1937. In 1916 there were 45 staff; this increased to 132 in 1922, 326 in 1929 and 1225 in 1939. In return for the exclusive right to market Hollerith equipment in Britain and the Empire (excluding Canada), BTM paid 25% of its revenues to the American company by way of royalties. This became an ever-increasing burden as the years progressed; BTM attempted to renegotiate the agreement on several occasions, but it was only finally terminated in 1948.During World War II, BTM was called upon to design and manufacture a machine to assist breaking the German Enigma machine ciphers. This machine, known as a bombe, was initially conceived by Alan Turing, but the actual machine was designed by BTM chief engineer Harold 'Doc' Keen, who had led the company's engineering department throughout the 1930s. The project was codenamed \"CANTAB\". By the end of the European war, over two hundred bombes had been built and installed.In 1959 BTM merged with former rival Powers-Samas to become International Computers and Tabulators Limited (ICT). ICT later became part of ICL (International Computers Limited).".
- British_Tabulating_Machine_Company wikiPageExternalLink bombe1.htm.
- British_Tabulating_Machine_Company wikiPageExternalLink btm1.htm.
- British_Tabulating_Machine_Company wikiPageExternalLink decoding_the_enigma_in_letchworth_1_1630801.
- British_Tabulating_Machine_Company wikiPageExternalLink resurrectionarticle?Article=1-7.
- British_Tabulating_Machine_Company wikiPageID "2540506".
- British_Tabulating_Machine_Company wikiPageLength "2900".
- British_Tabulating_Machine_Company wikiPageOutDegree "22".
- British_Tabulating_Machine_Company wikiPageRevisionID "645882244".
- British_Tabulating_Machine_Company wikiPageWikiLink Alan_Turing.
- British_Tabulating_Machine_Company wikiPageWikiLink Bletchley_Park.
- British_Tabulating_Machine_Company wikiPageWikiLink Bombe.
- British_Tabulating_Machine_Company wikiPageWikiLink Category:Cryptanalytic_devices.
- British_Tabulating_Machine_Company wikiPageWikiLink Category:Defunct_manufacturing_companies_of_the_United_Kingdom.
- British_Tabulating_Machine_Company wikiPageWikiLink Category:International_Computers_Limited.
- British_Tabulating_Machine_Company wikiPageWikiLink Category:Manufacturing_companies_established_in_1902.
- British_Tabulating_Machine_Company wikiPageWikiLink Computing-Tabulating-Recording_Company.
- British_Tabulating_Machine_Company wikiPageWikiLink Encryption.
- British_Tabulating_Machine_Company wikiPageWikiLink Enigma_machine.
- British_Tabulating_Machine_Company wikiPageWikiLink Harold_Keen.
- British_Tabulating_Machine_Company wikiPageWikiLink Herman_Hollerith.
- British_Tabulating_Machine_Company wikiPageWikiLink Hertfordshire.
- British_Tabulating_Machine_Company wikiPageWikiLink IBM.
- British_Tabulating_Machine_Company wikiPageWikiLink International_Computers_Limited.
- British_Tabulating_Machine_Company wikiPageWikiLink International_Computers_and_Tabulators.
- British_Tabulating_Machine_Company wikiPageWikiLink John_Harper_(computer_engineer).
- British_Tabulating_Machine_Company wikiPageWikiLink Letchworth.
- British_Tabulating_Machine_Company wikiPageWikiLink Powers-Samas.
- British_Tabulating_Machine_Company wikiPageWikiLink Unit_record_equipment.
- British_Tabulating_Machine_Company wikiPageWikiLink World_War_II.
- British_Tabulating_Machine_Company wikiPageWikiLinkText "BTM".
- British_Tabulating_Machine_Company wikiPageWikiLinkText "British Tabulating Machine Company".
- British_Tabulating_Machine_Company wikiPageUsesTemplate Template:No_footnotes.
- British_Tabulating_Machine_Company subject Category:Cryptanalytic_devices.
- British_Tabulating_Machine_Company subject Category:Defunct_manufacturing_companies_of_the_United_Kingdom.
- British_Tabulating_Machine_Company subject Category:International_Computers_Limited.
- British_Tabulating_Machine_Company subject Category:Manufacturing_companies_established_in_1902.
- British_Tabulating_Machine_Company hypernym Firm.
- British_Tabulating_Machine_Company type Company.
- British_Tabulating_Machine_Company type Company.
- British_Tabulating_Machine_Company type Establishment.
- British_Tabulating_Machine_Company comment "The British Tabulating Machine Company (BTM) was a firm which manufactured and sold Hollerith unit record equipment 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.The company was formed in 1902 as The Tabulator Limited, after Robert Porter obtained the rights to sell Herman Hollerith's patented machines from the US Tabulating Machine Company (later to become IBM).".
- British_Tabulating_Machine_Company label "British Tabulating Machine Company".
- British_Tabulating_Machine_Company sameAs Q4971132.
- British_Tabulating_Machine_Company sameAs m.07lwjk.
- British_Tabulating_Machine_Company sameAs Q4971132.
- British_Tabulating_Machine_Company wasDerivedFrom British_Tabulating_Machine_Company?oldid=645882244.
- British_Tabulating_Machine_Company isPrimaryTopicOf British_Tabulating_Machine_Company.