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By Antoine Gara

July 1, 2011 at 1:51 AM UTC

This article is for subscribers only.

BusinessWeek Cover Image (11_28, 190x400)

This article is part of the June 29, 2011 issue of businessweek.

When IBM turned 100 on June 16, it joined a surprising number of tech companies that have been evolving in order to survive since long before there was a Silicon Valley. Here’s a sampling of tech centenerians, and some of the breakthroughs that helped fuel their longevity.