When I was in my teens, I spent my summers rebuilding a LOT of Addressograph-Multigraph and (later) Farrington plate printing and embossing equipment. Some of this gear was impressive, either because of its mass (the big cast iron tag printers that were on pretty much every US Navy ship and military base) or its novelty at the time (the 6300 electronic card & plate embossers that were interfaceable to mini and mainframe computers). Learning the mechanical and electrical work on these machines made me a better engineer once I got to college.