Halliburton, AT&T, Massey Energy in focus By: MarketWatch April 06, 2010 at 08:48 AM EDT U.S. stock futures edged lower Tuesday as traders took some gains off the table after markets marched to multi-month highs in the prior session. Read More >> Related Stocks: AT&T Inc Baker Hughes Inc Halliburton Co Royal Bank Scotland Group Plc Schlumberger Ltd