TY - GEN AU - Raymond L Sanford C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1946-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.CIRC.456 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1946 TI - Circular of the Bureau of Standards no. 456::magnetic testing ER -