TY - GEN AU - Carl W Coblentz AU - Paul R Achenbach C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1958-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.6154 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1958 TI - Performance tests of four cleanable impingement air filters type 902, 912, 9102, 9802 ::manufactured by Research Products Corporation Madison, Wisconsin ER -