Computer and Scientific

Owner

BETZDEARBORN HYDROCARBON PROCESS GROUP INC.

Aug 4, 1998

Computer and Scientific

Owner

BETZDEARBORN HYDROCARBON PROCESS GROUP INC.

Aug 2, 1994

Computer and Scientific

Owner

BETZDEARBORN HYDROCARBON PROCESS GROUP INC.

Apr 27, 1993

Chemicals

Owner

BETZDEARBORN HYDROCARBON PROCESS GROUP INC

Jun 16, 1992

Computer and Scientific

Owner

BETZDEARBORN HYDROCARBON PROCESS GROUP INC.

May 26, 1992