Dehomag was a German subsidiary of IBM and later a standalone company with a monopoly in the German market before and during World War II. The word was a syllabic abbreviation for Deutsche Hollerith-Maschinen GmbH (). Hollerith refers to the German-American inventor of the technology of punched cards, Herman Hollerith. In April 1949 the company name was changed to IBM Deutschland.
Background
thumb|A general-purpose [[punched card from the mid twentieth century.]]
The technology of punched cards dates back to the 18th century when it was used for mass production of woven textiles and later used as a recording and playback system in player pianos. The use of punched cards for recording and tabulating data was first proposed and used by Semyon Korsakov around 1805. In 1832 Charles Babbage proposed using similar cards to program and to store computations for his calculating engine. Punched card technology was further developed for data-processing by Herman Hollerith from the 1880s. It was used for the 1890 United States census and for the census work of several foreign governments.
History
Willy Heidinger, an acquaintance of Hollerith, licensed all of Hollerith's The Tabulating Machine Company patents in 1910, and created Dehomag in Germany. In 1924 CTR was renamed IBM.
IBM New York established a special subsidiary in the occupied General Government territory, Watson Business Machines, to deal with railway traffic there during the Holocaust in Nazi occupied Poland.
Leon Krzemieniecki, the last surviving person involved in the administration of the rail transportation to Auschwitz and Treblinka, stated he knew the punched card machines were not German machines, because the labels were in English. Income from the machines leased in General Government was sent through Geneva to IBM in New York.