TY - GEN AU - Coblentz, Carl W AU - Achenbach, Paul R C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1958-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.6251 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1958 TI - Performance tests of two cleanable impingement air filters Vortox types VN1 and VN2 ::manufactured by Vortox Company Claremont, California ER -