FRENCH CGE UNIT TAKES 34 PCT STAKE IN ESCA CORP State-owned <Cie Generale d'Electricite>'s electrical contracting unit <CGEE ALSTHOM> has taken a 34 stake in the U.S. Computer firm <ESCA Corp>, CGEE ALSTHOM chairman Philippe Boisseau told a press conference. According to an agreement in principle between the two companies CGEE ALSTHOM could take a majority stake in the future but no time-scale has been set, he added. ESCA, which had a turnover of 13.6 mln dlrs in 1986 and is expected to see this rise to 20 mln this year, is one of the leading U.S. Suppliers of electric despatching and telecontrol systems.