In a service system, a plurality of image forming apparatuses and a control unit for remote-controlling them are connected by a communication line. A plurality of terminal units are located at respective service stations and also connected to the control unit. The image forming apparatuses each ...http://www.google.co.uk/patents/US5715496?utm_source=gb-gplus-sharePatent US5715496 - Remote service system for image forming apparatuses
