HARTFORD, Conn. (AP) -- United Technologies Corp., continuing to broaden its security business and expand its presence in China, said Sunday it has made an offer to buy Diebold Inc. for $2.63 billion. United Technologies, parent company of jet engine-maker Pratt & Whitney, Otis elevator and Sikorsky Aircraft, said it made the unsolicited offer Friday after trying to negotiate a deal with Diebold for two years. Diebold, based in Canton, Ohio, makes ATMs, business security systems and voting machines. The $2.63 billion purchase price represents United Technologies' offer of $40 per outstanding share, about two-thirds higher than Diebold's closing stock...