Here is another source for that. Would the various supercomputers be located in their corporate controlled buildings?
"While it is common to associate mainframe computers with IBM, the reality is that several manufacturers produced mainframe computers from the late 1950s through the 1970s. The group of manufacturers was often referred to as "Snow White and the Seven Dwarfs". In that context, Snow White was IBM and the seven dwarfs were Burroughs, UNIVAC, NCR, Control Data Corporation, Honeywell, General Electric and RCA. IBM will likely be a major player in the emerging generation of mainframe computing."
networkworld.com/article/2212166/lan-wan/snow-white-and-the-seven-dwarfs.html