** FILE ** The 3M logo is shown on a Filtrete air cleaning filter in Des Moines, Iowa in this Jan. 23, 2006 file photo. 3M Co., maker of Scotch tape, Post-It notes and industrial adhesives, on Tuesday, Jan. 29, 2008 said its fourth-quarter earnings fell from year-ago results that included a one-time gain. (AP Photo/Charlie Neibergall, file)

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