TY - GEN AU - Nolan D Mitchell AU - Edward D Bender AU - James V Ryan C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1952-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.BMS.129 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1952 TI - Fire resistance of shutters for moving-stairway openings: ER -