A device is provided that interfaces with existing point of sale credit card reading devices, and furnishes the option of transmitting data over either the existing modem installation or a radio frequency data communication network. The device scans the information encoded on the credit card to determine...http://www.google.com.au/patents/US5444763?utm_source=gb-gplus-sharePatent US5444763 - Translation and connection device for radio frequency point of sale transaction systems
