An electronic toll collection (ETC) system has a problem that the system cannot issue a receipt at the time of use, because the system permits an ETC vehicle to pass a tollgate nonstop. The invention intends to solve the problem and provides a receipt-issuing device while ensuring security. In order...http://www.google.ca/patents/US20040162788?utm_source=gb-gplus-sharePatent US20040162788 - Receipt-issuing device
