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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 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 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%
Hammer Technologies, Inc. ....................... Massachusetts 100%
Megatest Corporation ............................ Delaware 100%
Megatest Limited ............................ United Kingdom 100%
Megatest SARL ............................... France 100%
Megatest GmbH ............................... Germany 100%
Megatest H.K. Ltd. .......................... Hong Kong 100%
Megatest International ...................... California 100%
Megatest International Sales Corporation .... Barbados 100%
Megatest Asia Pte. Ltd. ..................... Singapore 100%
Zehntel Holdings, Inc. .......................... California 100%
1000 Washington, Inc. ........................... Massachusetts 100%
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