An automated library article terminal is externally operable by the user, to, through a delivery chute mounted and arranged to deliver articles through an external wall, automatically stock, vend, and selectively accept return of and re-stock, so that they can be re-vended, a plurality of reusable articles...http://www.google.com/patents/US5143193?utm_source=gb-gplus-sharePatent US5143193 - Automated library article terminal
