EXHIBIT 21

SUBSIDIARIES OF
ESCO TECHNOLOGIES INC.

	STATE OR JURISDICTION
	OF INCORPORATION	NAME UNDER WHICH IT
NAME	OR ORGANIZATION	DOES BUSINESS
Aclara Power-Line Systems Inc.	Missouri	Same
Aclara RF Systems Inc.	Ohio	Same
Aclara Software Inc.	Massachusetts	Same
Beijing Lindgren ElectronMagnetic Technology Co., Ltd.	People’s Republic of China	Same
Crissair, Inc.	California	Same
Distribution Control Systems Caribe, Inc.	Puerto Rico	Same
Doble Engineering Company	Massachusetts	Same
Doble Lemke AG	Switzerland	Same
Doble Lemke GmbH	Germany	Same
Doble PowerTest Limited	United Kingdom	Same
Doble TransiNor AS	Norway	Same
ESCO Technologies Holding Inc.	Delaware	Same
ETS Lindgren Engineering India Private Limited	India	Same
ETS Lindgren Japan, Inc.	Japan	Same
ETS Lindgren Limited	England	Same
ETS-Lindgren, L.P.	Texas	Same and Acoustics Systems
ETS-Lindgren OY	Finland	Same
Lindgren R.F. Enclosures, Inc.	Illinois	Same and ETS-Lindgren
PTI Technologies Inc.	Delaware	Same
TekPackaging LLC	Delaware	Same
VACCO Industries	California	Same
Xtensible Solutions, LLC	Delaware	Same