The system includes containers for storing articles to be distributed, and a computer-controlled locking system for controlling access to the articles. The initial inventory of articles stored in the container is bar-coded, and the bar code data provide a digital data record of articles stored and locked...http://www.google.com.au/patents/US5057677?utm_source=gb-gplus-sharePatent US5057677 - Transaction monitoring and security control system for the sale and distribution of articles
