Rank	Company Name	1998 Revenues (millions)	% Change from 1997
1	Raytheon Co.	$19,350.0	41.52%
2	Thermo Electron Corp.	$3,867.6	8.69%
3	Cabot Corp.	$1,626.1	-2.81%
4	Wyman-Gordon Co.	$812.0	15.14%
5	SLI Inc.	$773.1	105.53%
6	Watts Industries Inc.	$733.9	23.59%
7	Millipore Corp.	$699.3	-7.85%
8	Waters Corp.	$618.8	32.94%
9	UniFirst Corp.	$452.0	5.72%
10	Thermo Optek Corp.	$447.3	-12.72%
Source: Nordby International, Inc., Boulder, Co.