1. Siemens, Philips, Picker, Toshiba, and Elscint-would continue to dominate CT (although in some of these cases under different corporate parents) while the rest would exit. Trajtenberg includes an in-depth, yearby-year discussion of entrants. Trajtenberg, Economic Analysis of Product Innovation;Six entrants in this first wave-General Electric (GE)
2. EMI Patents on Computed Tomography; History of Legal Actions;A B Strong;The British Journal of Radiology,1994
3. EMI Patent Litigation in the US;A M Cormack;The British Journal of Radiology,1994