Also at the 22:10 mark of the HP YouTube
Ah yes: “David Packard (seated) and William Hewlett working in their garage in 1938.”
In general, the displacement of slide rules by electronic computers would be an interesting topic. Faber-Castell, a German manufacturer of classic slide rules, launched hybrid slide rules in the early 1970s (upper side electronic calculator, back side slideruler). They had a certain success for a while because examination regulations at schools and universities did not yet allow electronic calculators.