ST. PAUL, Minn.--(BUSINESS WIRE)--3M (NYSE: MMM) today announced the following investor events: Second-quarter 2015 earnings conference call on Thursday, July 23, 2015, at 8 a.m. CDT. The live webcast, press release and supporting slide presentation will be available on 3M’s Investor Relations website at http://investors.3M.com. The earnings call may also be accessed at (800) 762-2596 within the U.S. or +1 (212) 231-2916 outside the U.S. 2015 InvestMNt Conference in Minneapolis, Minn., on Wedne