I think my HS made theirs, it looked like heating lights used for chickens, it was just in a box. In fact all the frames and thing that held them were made in the HS wood shop and metal shot. Students made the frame holder, it was poorly welded, but it worked. They were made 20 or more years before I even had the class. The frames the wood shop teacher replaced regularly though, they weren't that old. I thought maybe silk screen shirts were new when they decided they wanted to make them, it would have obviously pre-dated computers. I know shirts from the 70s aren't slick screened, they had a iron on graphic or something, at least all the vintage Star Wars shirts are like that.