A user can place the multifunctional mobile appliance in a work area bounded by a set of impulse radio, or GPS, transceivers. The appliance independently and accurately maps the work area and proceeds to perform one or more tasks over that area, as directed by the user. These tasks include, but are not...http://www.google.com/patents/US6611738?utm_source=gb-gplus-sharePatent US6611738 - Multifunctional mobile appliance
