Description: alphanumeric string associated with a manufactured product that can be used to track the date, time, and circumstances of manufacture; Name: fabrication number
Description: alphanumeric character sequence assigned to a fabricated product, which allows the date, time and circumstances of fabrication to be traced; Name: fabrication number
Description: Speed of rotation at which the frequency of vibration (or its multiples) corresponds to the rotor resonant (lateral or torsional) ; Name: Critical speed