SPIE BATIGNOLLES COULD INCREASE COMSTOCK HOLDING Construction group <Spie Batignolles> is negotiating to increase its holding in U.S. Engineering and electrical installations firm <Comstock>. Spie Batignolles, a subsidiary of Schneider SA <SCHN.PA>, said in a statement it was negotiating to invest 20 mln dlrs in Comstock in the form of bonds convertible into shares. Spie Batignolles has held a 20 pct stake in Comstock since February 1986. A spokesman said if Spie Batignolles converted all the new bonds, it could open the way for the French company to take control of Comstock but he gave no other details.