X0202 4 2006-06-20 0 0001049502 MKS INSTRUMENTS INC MKSI 0000032604 EMERSON ELECTRIC CO 8000 W. FLORISSANT AVE. ST LOUIS MO 63136 0 0 1 0 0001276808 ASTEC AMERICA INC 5810 VAN ALLEN WAY CARLSBAD CA 92008 0 0 1 0 Common Stock 2006-06-20 4 S 0 25000 19.03 D 5614405 I Through a subsidiary Common Stock 2006-06-21 4 S 0 17000 19.01 D 5597405 I Through a subsidiary Common Stock 1065182 D The reported securities are owned directly by Astec America Inc. The Reporting Person is the ultimate parent company of Astec America Inc. The reported securities are owned directly by Emerson Electric Co. See Exhibit 99.1 - Joint Filer Information /s/ Timothy G. Westman, Assistant Secretary for Emerson Electric Co. 2006-06-22 /s/ Timothy G. Westman, Secretary for Astec America Inc. 2006-06-22