TY - GEN AU - Wright, John D AU - Mattingly, George E C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1998-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.250-49 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1998 TI - NIST calibration services for gas flow meters ::piston power and bell prover gas flow facilities ER -