TY - CONF AU - Sullivan, Donald C2 - 2001 IEEE Intl. Frequency Control Symposium , Seattle, WA DA - 2001-01-01 LA - en PB - 2001 IEEE Intl. Frequency Control Symposium , Seattle, WA PY - 2001 TI - Time and Frequency Measurement at NIST: The First 100 Years ER -