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@branwen
I thought EPS had been around longer than Di2, but had not been in any way finished, until the sudden arrival of Di2 forced their hand.
Will see if I can find anything to back this up
http://velonews.competitor.com/2011/11/bikes-and-tech/technical-faq/lennard-zinn-the-20-year-history-of-campagnolo-electronic-power-shift-eps_198080