Thanks for your input. I'm not familiar with these machines so I look forward to reading that link.
The researcher does say:
>IBM engineers had to create Hollerith codes to differentiate between a Jew who had been worked to death and one who had been gassed, then print the cards, configure the machines, train the staff, and continuously maintain the fragile systems every two weeks on site in the concentration camps
The researcher does say:
>IBM engineers had to create Hollerith codes to differentiate between a Jew who had been worked to death and one who had been gassed, then print the cards, configure the machines, train the staff, and continuously maintain the fragile systems every two weeks on site in the concentration camps
Source https://www.huffpost.com/entry/ibm-holocaust_b_1301691
Though it's not clear in this passage whether he is referring to IBM itself or its German subsidiary.