By John Tilak TORONTO (Reuters) - Canada's main stock index slipped on Friday, putting it on track for a third straight weekly drop as concerns about potential monetary policy tightening by the U.S. Federal Reserve offset positive economic signals from China. Data showed that Chinese factory output growth in July was the strongest since the start of the year, indicating that the world's second-largest economy may be stabilizing. Shares of BlackBerry Ltd jumped more than 7 percent after several sources told Reuters that the smartphone maker is looking at the possibility of going private. ...



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