Tried to remind hard where i have seen such a thing as John described; and at last I could . In my early childhood, when I was probably a student of first or second standard, I went to a printer's workshop with my father, for some of his publications . I seen there a huge machine, printing pages one by one as a man pulls a rod. It was making a noise, too.
At that place, I also seen some metallic words of mirror shape, placed in cases. A man putting them side by side in a metal tray, to make a page. Easy to read, just place it in front of a mirror. I was astonished a lot.
Whatever it may be, it made me remind my father. Thanks a lot, John !