TY - GEN AU - F C Breckenridge C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1956-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.4456 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1956 TI - Comparative table chromaticity requirements of U.S. and international specifications and standards for aviation signal light colors: ER -