Exhibit 21

SUBSIDIARIES OF THE COMPANY

Name	State or Province of Incorporation
Spectrum Control, Inc.	Pennsylvania
Spectrum Control, Inc.	Delaware
Spectrum Engineering International, Inc.	Delaware
Spectrum Control Technology, Inc.	Delaware
Spectrum FSY Microwave, Inc.	Maryland
Spectrum SEI Microwave, Inc.	Delaware
Spectrum Microwave, Inc.	Delaware
Spectrum Sensors and Controls, Inc.	California
Spectrum Sensors and Controls, Inc.	Pennsylvania
Spectrum Control GmbH	Germany
Spectrum Control de Mexico	Mexico
Spectrum Control (Hong Kong) Limited	Hong Kong
Spectrum Control Electronics (Dongguan) Co. LTD.	Peoples Republic of China
Spectrum Sensors and Controls, Inc.	Ohio
CMT Filters, Inc.	Delaware
SenDEC Corp.	New York
API Cryptek Inc. d/b/a ION Networks	Delaware
API Electronics Group Corp.	Ontario
API Electronics, Inc.	Delaware
API Nanofabrication and Research Corporation	Delaware
API Nanotronics Holdings Corp.	Ontario
API Nanotronics Sub, Inc.	Ontario
API Systems, Inc.	Delaware

API Defense, Inc.	Delaware
API Defense USA, Inc.	Delaware
Emcon USA, Inc.	Delaware
Cryptek Holdco UK Limited.	United Kingdom
Emcon2007 Holdco Inc.	Canada
Emcon Emanation Control Ltd.	Canada
Filtran Inc.	New York
Filtran Limited	Ontario
Keytronics Inc.	New York
National Hybrid, Inc.	New York
Pace Technology, Inc.	Florida
Secure Computer Systems Ltd.	United Kingdom
Secure Systems & Technologies, Ltd.	United Kingdom
Secure Systems Production Limited	United Kingdom
TM Systems II, Inc.	Delaware