TY - RPRT TI - Performance test of the Roll-O-Tron electronic air cleaner, model #3-50HV : manufactured by American Air Filter Company Louisville, Kentucky AU - Coblentz, Carl W AU - Achenbach, Paul R PY - 1962 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 7772 DO - 10.6028/NBS.RPT.7772 ER -