The tokens were patented by Elisnor Corporation, owner of the Four Queens in LV. They were partners with Playboy in the AC casino. When Playboy lost their license Elisnor took over the casino and renamed it the Atlantis.

The tokens were used at all 3 properties and there were several different colors at the FQ's. Not sure about colors at the other 2 places.

The Rio licensed the patent when they opened and used the system also.

A good friend Dick Levassuer patented the system while working at the FQ's. It might have been the 1st slot tracking system.