== Use of computers == 

 I'm curious about this sentence from the Joseph Barbera article in Ephraim Katz's Encyclopedia of Film: 

 : "In 1957, Hanna and Barbera left MGM and set up their own production company, Hanna-Barbera, a virtual factory turning out television cartoons at an astonishing rate through a computerized numbering system." 

 Does anyone know any details about exactly when and how the company began using such a system? The sentence implies that it was unusual at the time.