A few decades back I fabricated and wired industrial controls. While wiring, we used cow magnets to attach the blueprints to the open cabinet doors so that they

A few decades back I fabricated and wired industrial controls. While wiring, we used cow magnets to attach the blueprints to the open cabinet doors so that they were always within sight was we strung wires between PLCs, terminal blocks, relays, buttons, etc. Even when there were several pages of blueprint stapled together a few cow magnets tended to hold them in place. You just had to be sure to orient them such that they didn’t roll down the door.