A bar code reader system is required to be integrated into an energy dispenser that is able to read a variety of bar code formats printed on a variety of media. The bar code reader system accepts both bar encoded cards having very low aspect ratios and other printed bar encoded media having differing...http://www.google.com.hk/patents/US6062473?utm_source=gb-gplus-share專利 US6062473 - Energy dispensing system having a bar code scanning unit
