Insights auto threads is broken atm, so I'm manually creating these for new Insight articles.
The Relativator was sold by (as printed) Atomic Laboratories, Inc. 3086 Claremont Ave, Berkeley 5, California , which seems to be a division of Cenco Instruments (Central Scientific Company)...
Source: https://www.physicsforums.com/insights/relativator-circular-slide-rule-simulated-with-desmos/
by @robphy