EXHIBIT 21 LIST OF SUBSIDIARIES - - ------------------------------ ---------------- ------------------------------ NAME STATE, COUNTRY DOING BUSINESS AS OF INCORPORATION - - ------------------------------ ---------------- ------------------------------ SYMTRON CORPORATION California, USA Symtron Corporation PRITEC CORPORATION (1) California, USA Pritec Corporation ELEXSYS INTERNATIONAL (EUROPE) United Kingdom Elexsys International (Europe) LIMITED Limited - - ------------------------------ ---------------- ------------------------------ (1) Wholly-owned subsidiary of Symtron Corporation.