Earlier quoted context omitted.
Nope, there is quite detailed book on that. They were on place, in Germany and occupied territories. Installing machines, designing punch cards with cooperation of users and training users. Some machines were directly in concentration camps and some on railways used to transport Jews. If you got there to maintain, you seen them. Some were used to sort people by race on occupied territories - and even if you not knew…
Do you have any references for that? I'm quite incredulous that American IBM employees were on place, in Germany and occupied territories, during a time that America was engaged in war with Germany.
IBM had child company in Germany Dehomag, but transported machines and cards from outside too (including during war through not whole of it). The book however deals more with management and non-German citizens guilt which is harder to show. That people of all sorts in the Germany, including technologistics, were contributing to Nazi plans is easier to believe. It was just first example that came to my mind.