I worked in a printing press ten years ago, and all of the pressmen and binding-machine operators were deaf (congenitally, not from the equipment) and thus fluent in ASL. I'm not sure if management sought them out or if one guy got hired and started recommending his friends, but it worked out well. They could communicate with one another perfectly in places where even shouting was inaudible, and they often seemed to be better at communicating even with people who didn't know ASL just because they were so good at nonverbal communication.