TY - RPRT TI - Performance tests of two cleanable impingement air filters type P-5 : manufactured by Air-Maze Corporation Cleveland, Ohio AU - Coblentz, Carl W AU - Achenbach, Paul R PY - 1959 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 6428 DO - 10.6028/NBS.RPT.6428 ER -