A method and system is disclosed for building a database for use in a retail store marketing program. A reader scans a customer's check which has been received at the retail store to detect a checking account identification number. The checking account identification number provides a unique customer...http://www.google.com.tw/patents/US5305196?utm_source=gb-gplus-share專利 US5305196 - Check transaction processing, database building and marketing method and system utilizing automatic check reading
