In conjunction with the play of the game of Keno, a combination ticket holder and transmitter-receiver is located at each player's table. Each player's transmitter is coded with a number (e.g., 60,000) of two-tone sequential codes which are transmitted to Keno runners preassigned to specific tables and...http://www.google.es/patents/US4254404?utm_source=gb-gplus-sharePatente US4254404 - Paging and servicing system
