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EXHIBIT 22.1
PRESENT SUBSIDIARIES
PERCENTAGE
STATE OR OF VOTING
JURISDICTION SECURITIES
INCORPORATION OWNED
------------------- ----------
Teradyne Benelux, Inc. (Ltd.)................................. Delaware 100%
Teradyne Canada Limited....................................... Canada 100%
Teradyne GmbH................................................. Germany 100%
Teradyne Holdings, Inc........................................ New Hampshire 100%
Teradyne Holdings Limited..................................... United Kingdom 100%
Teradyne Limited............................................ United Kingdom 100%
Teradyne Hong Kong, Ltd. ..................................... Delaware 100%
Teradyne International, Ltd. ................................. U.S. Virgin Islands 100%
Teradyne Ireland Limited...................................... Ireland 100%
Teradyne Italia S.r.L. ....................................... Italy 100%
Teradyne Japan, Ltd. ......................................... Delaware 100%
Teradyne K.K. .............................................. Japan 100%
Teradyne Korea, Ltd. ......................................... Delaware 100%
Teradyne Leasing, Inc. ....................................... Massachusetts 100%
Teradyne Malaysia, Ltd. ...................................... Delaware 100%
Teradyne Midnight Networks Inc................................ Delaware 100%
Teradyne Netherlands B.V. .................................... Netherlands 100%
Teradyne Netherlands, Ltd. ................................... Delaware 100%
Teradyne Realty, Inc. ........................................ Massachusetts 100%
Teradyne S.A. ................................................ France 100%
Teradyne Scandinavia, Inc. ................................... Delaware 100%
Teradyne Singapore, Ltd. ..................................... Delaware 100%
Teradyne Software and Systems Test, Inc. ..................... Delaware 100%
Teradyne Taiwan, Ltd. ........................................ Delaware 100%
Control Automation, Inc....................................... Delaware 100%
Hammer Technologies, Inc. .................................... Massachusetts 100%
Kinetrix, Inc................................................. Delaware 84%
Megatest Corporation.......................................... Delaware 100%
Megatest Limited............................................ United Kingdom 100%
Megatest SARL............................................... France 100%
Megatest GmbH............................................... Germany 100%
Megatest H.K. Ltd. ......................................... Hong Kong 100%
Teradyne Philippines Ltd.................................... California 100%
Megatest International Sales Corporation.................... Barbados 100%
Megatest Asia Pte. Ltd. .................................... Singapore 100%
Zehntel Holdings, Inc. ....................................... California 100%
1000 Washington, Inc. ........................................ Massachusetts 100%