Telecomunicaciones y tecnología
Stocks edge up at open, Caterpillar lags
The Dow Jones industrial average gained 28.73 points, or 0.21 percent, to 13,587.65. The Standard & Poor's 500 Index advanced 3.13 points, or 0.21 percent, to 1,460.02. The Nasdaq Composite Index rose 8.73 points, or 0.28 percent, to 3,169.51.
(Reporting by Chuck Mikolajczak; Editing by Kenneth Barry)