A deck of cards is coded by marking each card on its face with a bar code which is essentially invisible to the human eye, but can be read by a detector matched to the source of wavelength of the light used to irradiate each card as it is passed over the surface of a portable housing which houses the...http://www.google.co.uk/patents/US5067713?utm_source=gb-gplus-sharePatent US5067713 - Coded playing cards and apparatus for dealing a set of cards
