This article...

https://en.wikipedia.org/wiki/Differential_analyser

says...

"In 1947, UCLA installed a differential analyser built for them by General Electric at a cost of $125,000.[22] By 1950, this machine had been joined by three more.[23] The UCLA differential analyzer appeared in 1951's When Worlds Collide, where it was called, euphemistically, "DA"."

For those interested in learning more about ball-disk integrators, the key element of these machines, this article is helpful...

https://en.wikipedia.org/wiki/Ball-and-disk_integrator