I never worked at a printing company, but I spent a semester in seventh grade sorting lead type in shop class. In the early 1970s I edited a little magazine that was set with an IBM Composer. The printer ran it from a minicomputer that handled all the justification and even the spell checking.
I was pretty sure TANG didn't provide this machine to office clerks.
Heh :) those old typesetters cost a fortune. I was a little later in the industry but even our old 202 cost an arm and a leg, and the full-blown XYVision cost as much as a small mansion. No way did office clerks get their hands on such equipment.