Interval, Call Processing : A measurement that begins at the time the dispatch agency makes its first contact with a caller reporting a medical event, and the time that response resources are notified of the event
NFPA 45 Standard on Fire Protection for Laboratories Using Chemicals, 2004 ed. http://eetd-safety.lbl.gov/sites/all/files/NFPA%20 45-2015%20LBNL%20Class%20Slides.pdf, (Std: Fr Prac for Lab Using Chem - Amer) {204 NFC}