Dec 20 (Reuters) - Canada's main stock index opened higher on Friday after the U.S. House of Representatives approved a new North American trade deal, while BlackBerry shares surged after reporting better-than-expected quarterly revenue.
* At 9:30 a.m. ET (14:30 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was up 57 points, or 0.33%, at 17,121.04.