TY - GEN AU - Daniel J Chwirut C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1974-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.74-434 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1974 TI - Test and evaluation of baby walkers and walker-jumpers: ER -