An information input device including an information writing; section for writing information on a writing medium, a position recognizing section for recognizing a position of the information writing section on the writing medium, and an information storing section for storing information obtained from...http://www.google.com.au/patents/US6335727?utm_source=gb-gplus-sharePatent US6335727 - Information input device, position information holding device, and position recognizing system including them
