A machine, functioning as a unit, is composed of a main module and at least one replacable module having an ID. The main module includes (i) an ID recognition unit programmed to receive ID information from each replacable module, and (ii) an action decision unit including a decision algorithm programmed...http://www.google.com/patents/US6708068?utm_source=gb-gplus-sharePatent US6708068 - Machine comprised of main module and intercommunicating replaceable modules
