A multiple rapper control (10) for an electrostatic precipitator for monitoring and individually controlling each of a plurality of rappers based on computer (12) stored rapper characteristics including the voltage type, the voltage level, the pre-set electrical input current, the minimum increment between...http://www.google.se/patents/US5173867?utm_source=gb-gplus-sharePatent US5173867 - Multiple rapper control for electrostatic precipitator
