R.R. Donnelley ( RRD) signed a definitive agreement to sell Peak Technologies to Platinum Equity.Terms weren't disclosed, but Chicago-based Donnelley said in December 2004 it intended to sell Peak, a systems integrator of automatic identification and data collection equipment and systems. The Peak business has been reported as a discontinued operation since the fourth quarter of 2004. The transaction is subject to regulatory approval and is expected to close by the end of 2005. On Friday, Donnelley rose a penny to $35.10.