Name

Jurisdiction in which incorporated

Bruce Technologies, Inc

State of Massachusetts

BTU Europe Ltd.

United Kingdom

BTU International, Inc.

State of Delaware

BTU Ltd. (Shanghai)

China

BTU Overseas, Ltd.

State of Delaware

BTU Overseas (Shanghai) Co., Ltd.

China

Intersurface Dynamics, Inc.

State of Connecticut

P.R. Hoffman Machine Products, Inc.

State of Arizona

Tempress Systems, Inc.

State of Texas