EXHIBIT 21
SUBSIDIARIES OF THE COMPANY
ALTIA, LLC – Arizona limited liability company
Quality Circuit Assembly, Inc. – California corporation
American Precision Fabricators, Inc. – Arkansas corporation
Morris Sheet Metal, Corp. – Indiana corporation
JTD Spiral, Inc. – Indiana corporation
Deluxe Sheet Metal, Inc. – Indiana corporation
Excel Fabrication, LLC – Idaho Limited Liability Company
A4 Construction Services, Inc. – Delaware corporation
A4 Manufacturing, Inc. – Delaware corporation
A4 Technologies, Inc. – Delaware corporation
Spectrumebos, Inc. – Delaware corporation
