I was a Nucor engineer in the early 2010s, and all their rolling mills had them by then. Things had changed a lot since the '90s, though. The old guys talked

I was a Nucor engineer in the early 2010s, and all their rolling mills had them by then. Things had changed a lot since the '90s, though. The old guys talked about having to manually replace the electrodes in the arc furnaces, which has been done with a robot arm since the late '90s or early 2000s. (For those of you who don't know what this is, each electrode is a graphite column one or two feet in diameter and about 20 feet long. Replacing them took two guys, selected for their resemblance to linebackers, and had to be done multiple times each day.)