Your description of the ER shelving contraption sounds like how they used
to provide phone books at public telephones. It usually hung down below
a shelf and you swung it up to lay it on the shelf and open it. Your local
phone company might have some leads.

Rebecca Davis, Outreach Librarian
Health Sciences Libraries
UC Davis Medical Center Library
2252 45th St., Sacramento, CA 95817
[log in to unmask]
916-734-4634 or 530-754-5874