P245 CEEFAX 245 Fri 15 Apr 21:19/46    WALL STREET    (Midday): Shari prices remained firm at mid-session but were below their bjut as the market tracked movements in bond prices. Volume was said to bj extremely high in view of the expiry of April option's contracts. Industrial production figures, in line with market forecasts, had little impact. * US industrial production rose 0.5% in March, after a revised rise of 0.6% in February.  World indices 243 Dow Jones 242 Euro/East Dow Jones Exchanges Would Ind