P529ORACLE 529 Mon10 Feb C4 1714:24   STONE'S ITALIAN JOB   IN BRIEF  Stone International has won a £2.4m contract to provide air conditioning for 100 luxury coaches on Italy's trains. Stone has won £11m worth of business in the transport sector since December.  Aga is to build an air separation plant in Brazil that is due to go on stream in 1988.  Technology for Business has unveiled orders worth £5m won by its RAIR super-microcomputer subsidiary. City headlines 500 Newsfile 520