Apparatus for finishing of workpieces comprising: a beam generator for providing a line of sight; voltage activating beam impinging along the line of sight on a workpiece surface to be finished, thereby causing the workpiece surface to be charged with electrical charges having a first polarity; an electrostatic...http://www.google.fr/patents/US5517768?utm_source=gb-gplus-shareBrevet US5517768 - Apparatus and method for finishing processes
