The present invention relates to RFID devices, including handheld RFID devices, and applications for such devices. The devices and applications may be used in connection with items that are associated with an RFID tag, and optionally a magnetic security element. The devices and applications are described...http://www.google.com/patents/US6232870?utm_source=gb-gplus-sharePatent US6232870 - Applications for radio frequency identification systems
Applications for radio frequency identification systems