Dehomag

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.