Tickets for an instant lottery are imprinted with lottery numbers and serial numbers that are uniquely related and the lottery numbers are covered from view until after purchase, to provide control and distribution of winners and a high degree of security from fraud. By means of computerized fabrication...http://www.google.fr/patents/US4398708?utm_source=gb-gplus-shareBrevet US4398708 - Method of fabricating and securing playing cards for instant lotteries and games
Method of fabricating and securing playing cards for instant lotteries and games
