On: An 8-tube module from a 1954 IBM 705 mainframe: it...

[quickben]

I vaguely recall reading there were only a handful of companies offering computing at a scale, and none had the breadth of IBM. So, monopoly?

[qubex → quickben]

An antitrust suit was filed under the Sherman Act on 17 January 1969. It went to trial on 19 May 1975. It was eventually withdrawn on 8 January 1982 (what a coincidence).