A file system includes a processing device that processes first data with at least one of a copying function to read image data of an original document and record the read image data on a sheet, a transmitting function to send and receive image data and/or character data via a communication line, and...http://www.google.de/patents/US7509317?utm_source=gb-gplus-sharePatent US7509317 - Filing system and method for avoiding filing of identical document data
