A cartridge assembly of the type to receive a card with coded information designed to be retrieved or read so as to provide electrical signals corresponding to selected indicia (i.e., points) on the card. These signals are then used to operate any suitable read-out or print-out device to display the...http://www.google.de/patents/US4480180?utm_source=gb-gplus-sharePatent US4480180 - Cartridge assembly for data-sensing system
