TY - GEN AU - I Nimeroff C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1974-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.74-603 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1974 TI - A standard procedure for setting of photoelectric controls prior to installation on lighted obstructions: ER -