ASSOCIATED RESEARCH, INC., Lake Forest (near Chicago), Illinois;
Electrical safety compliance testing instruments
        UL, CSA, IEC, VDE, TÜV, and the European Norms including the 500VA safety test.

THERMO SCIENTIFIC KEYTEK, Lowell, Massachusetts (northwest of Boston, near New Hampshire)
EMC immunity test systems
        ANSI/IEEE C62.41 (Categories A,B&C)
        Bellcore LSSGR, GR-1089-CORE, TR-NWT-1089
        British Telecom standards
        CCITT Rec. K.17/20/21
        EN 55011/14/22, 61000-4-2/3/4/5/6/8/9/11
        ENV50140
        ETSI
        FCC Part 68
        IEC 1000-4-2/3/4/5/6/8/9/11
        UL 864 (Ring Wave)
        UL 1449 (3kA Combination Wave)

TRANSIENT SPECIALISTS, INC., Western Springs (near Chicago), Illinois
Thermo KeyTek Equipment Rental and Used Equipment Sales