In the 60s, you'd have offices with thousands of such machines: https://aurorasginjoint.com/2017/08/19/a-look-at-billy-wilders-the-apartment-office-wise/ https:

In the 60s, you'd have offices with thousands of such machines: https://aurorasginjoint.com/2017/08/19/a-look-at-billy-wilders-the-apartment-office-wise/ https://aurorasginjoint.com/2017/08/19/a-look-at-billy-wilde... (in the movie, he mentions 30k employees on all the floors). On this floor, I believe they're mechanical calculators with extra functions (unsure what).