An electrographic copier/duplicator has a development station with a sump for holding a supply of two-component developer material. A magnetic brush applies the developer material to a photoconductor moved past the magnetic brush. The developer material may comprise carriers of hard, magnetic material....http://www.google.es/patents/US4634286?utm_source=gb-gplus-sharePatente US4634286 - Electrographic development apparatus having a continuous coil ribbon blender
Electrographic development apparatus having a continuous coil ribbon blender
