Exhibit 21

SUBSIDIARIES

The subsidiaries of the Company as of
October 29, 2004 are as follows:

|Name of Subsidiary                                    |  | Jurisdiction ofIncorporation
|----------------------------------------------------- |  | ----------------------------
|                                                      |  |                             
|Advanced Input Devices, Inc.                          |  | Delaware                    
|Memtron Technologies Co.                              |  | Delaware                    
|Advanced Input Devices (UK) Ltd.                      |  | England                     
|LRE Medical GmbH                                      |  | Germany                     
|Esterline Input Devices (Shanghai) Ltd.               |  | China                       
|                                                      |  |                             
|Armtec Defense Products Co.                           |  | Delaware                    
|Armtec Countermeasures Co.                            |  | Delaware                    
|                                                      |  |                             
|Auxitrol Technologies S.A.                            |  | France                      
|Auxitrol S.A.                                         |  | France                      
|Auxitrol Co.                                          |  | Delaware                    
|                                                      |  |                             
|BVR Technologies Co.                                  |  | Delaware                    
|                                                      |  |                             
|Equipment Sales Co.                                   |  | Connecticut                 
|                                                      |  |                             
|Fluid Regulators Corporation                          |  | Ohio                        
|                                                      |  |                             
|Hytek Finishes Co.                                    |  | Delaware                    
|                                                      |  |                             
|Kirkhill - TA Co.                                     |  | California                  
|                                                      |  |                             
|Korry Electronics Co.                                 |  | Delaware                    
|AVISTA, Incorporated                                  |  | Wisconsin                   
|                                                      |  |                             
|Leach International Corporation                       |  | Delaware                    
|Guizhou Leach-Tianyi Aviation Electrical Company Ltd. |  | China                       
|Leach International Mexico S. de R.L. de C.V.         |  | Mexico                      
|                                                      |  |                             
|Leach International Europe S.A.                       |  | France                      
|                                                      |  |                             
|Mason Electric Co.                                    |  | Delaware                    
|                                                      |  |                             
|Muirhead Aerospace Limited                            |  | England                     
|                                                      |  |                             
|Norwich Aero Products Ltd.                            |  | New York                    
|                                                      |  |                             
|Pressure Systems, Inc.                                |  | Virginia                    
|                                                      |  |                             
|Weston Aerospace Ltd.                                 |  | England                     

The above list excludes certain
subsidiaries that, considered in the aggregate as a single subsidiary, would not
constitute a significant subsidiary as of October 29, 2004.

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