https://en.wikipedia.org/wiki/IBM_and_the_Holocaust
the Nazi used Good old American know how ... they didn't just guess
Edwin Black details how IBM not only leased Nazi Germany the machines, but then provided continuous maintenance service, and sold the spare parts and the special paper needed for the customized punch cards.[9]
No machines were sold – only leased. IBM was the sole source of all punch cards and spare parts. It serviced the machines on site either directly or through its authorized dealer network or field trainees. There were no universal punch cards. Each series of cards was custom-designed by IBM engineers to capture information going in and to tabulate information the Nazis wanted to extract.
— Edwin Black, on updates in 2002[6]
After the publication of the 2012 expanded edition, he wrote for the Huffington Post, "The punch cards, machinery, training, servicing, and special project work, such as population census and identification, was managed directly by IBM headquarters in New York, and later through its subsidiaries in Germany, known as Deutsche Hollerith-Maschinen Gesellschaft (DEHOMAG), Poland, The Netherlands, France, Switzerland, and other European countries." He added that the punch cards bore the indicia of the German subsidiary Dehomag.[10]
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