"Every technology era has its four horsemen driving growth and innovation"<p>It appears to cherry pick solution. Mainframe computing in the 1960s and 1970s was dominated by IBM. IBM controlled over 50% of the market. The competition was first "the seven dwarves" and later five, also known as "BUNCH" (<a href="http://en.wikipedia.org/wiki/BUNCH" rel="nofollow">http://en.wikipedia.org/wiki/BUNCH</a>).<p>What are the other three horsemen which could be compared to IBM?