An electrostatic precipitator includes several dividable supporting rods, which are passed through corresponding big holes, and tightly fitted in corresponding small holes of metallic boards so as to support the metallic boards equidistantly spaced apart in position. Each supporting rod is made of several...http://www.google.com.au/patents/US6852149?utm_source=gb-gplus-sharePatent US6852149 - Electrostatic precipitator
