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Pacific Bell said it will hire 350 new technicians and reassign up to 400 others to cut waiting times for installation of second phone lines. Orders for new phone lines in the state are running 15% to 20% higher than last year. . . . Milpitas-based LSI Logic Corp., beefing up its engineering services expertise, bought closely held Mint Technology Inc. for an undisclosed sum. Mint Technology, based in Billerica, Mass., provides electrical engineering services to semiconductor companies to help them speed up the development of computer chips.