EXHIBIT 21
 
   Name
    
    Place of
 Incorporation
 GENERAL CORPORATE ADMINISTRATION
 BZ Holdings Inc.
    
    Delaware, U.S.CBE Services, Inc.
    
    Delaware, U.S.CI Finance, Inc.
    
    Delaware, U.S.Cooper (China) Co., Ltd.
    
    ChinaCooper Bermuda Investments Ltd.
    
    BermudaCooper Bussmann Finance, Inc.
    
    Delaware, U.S.Cooper Finance (Bermuda) Ltd.
    
    BermudaCooper Finance (Canada) L.P.
    
    AlbertaCooper Finance Group, Ltd
    
    BermudaCooper Finance Group, S a.r.l.
    
    LuxembourgCooper Finance U.S., Inc.
    
    Delaware, U.S.Cooper Global LLC
    
    Delaware, U.S.Cooper Holdings Ltd.
    
    BermudaCooper Holdings (Gibraltar) Limited
    
    GibraltarCooper Hungary Group Financing Limited Liability Company
    
    HungaryCooper India Private Limited
    
    IndiaCooper Industries (Gibraltar) Limited
    
    GibraltarCooper Industries Finanzierungs-GbR
    
    GermanyCooper Industries Foundation
    
    Ohio, U.S.Cooper Industries FZE
    
    Sharjah, UAECooper Industries International, LLC
    
    Delaware, U.S.Cooper Industries Vietnam, LLC
    
    Delaware, U.S.Cooper Industries, Inc.
    
    Delaware, U.S.Cooper International Finance, Inc.
    
    Delaware, U.S.Cooper Investment Group Ltd.
    
    BermudaCooper Investments Partners GmbH Co., KG
    
    GermanyCooper Investments Verwaltungsgesellschaft mbH
    
    GermanyCooper Luxembourg Finance S à.r.l.
    
    LuxembourgCooper Offshore Holdings Ltd.
    
    BermudaCooper Pensions Limited
    
    United KingdomCooper Power Systems Finance, Inc.
    
    Delaware, U.S.Cooper Power Tools Finance, Inc.
    
    Delaware, U.S.Cooper Securities, Inc.
    
    Texas, U.S.Cooper US, Inc.
    
    Delaware, U.S
 1




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##### 



Name
    
    Place of
Incorporation
 ELECTRICAL PRODUCTS
 Alpha Lighting, Inc.
    
    Delaware, U.S.Arrow-Hart, S.A. de C.V.
    
    MexicoAtlantic Scientific Corporation
    
    Delaware, U.S.Broomco (1644) Limited
    
    United KingdomBussmann do Brasil Ltda.
    
    BrazilBussmann International, Inc.
    
    Delaware, U.S.Bussmann, S. de R.L. de C.V.
    
    MexicoCannon Technologies, Inc.
    
    Minnesota, U.S.CEAG Notlichtsysteme GmbH
    
    GermanyComponentes de Iluminacion, S. de R.L. de C.V.
    
    MexicoCooper (UK) Group Limited
    
    United KingdomCooper B-Line Limited
    
    United KingdomCooper B-Line, Inc.
    
    Delaware, U.S.Cooper Business Enterprise (Shanghai) Co., Ltd.
    
    ChinaCooper Bussmann Hungaria Kft.
    
    HungaryCooper Bussmann (U.K.) Limited
    
    United KingdomCooper Bussmann India Private Limited
    
    IndiaCooper Bussmann, LLC
    
    Delaware, U.S.Cooper Capri S.A.S.
    
    FranceCooper Controls (U.K.) Limited
    
    United KingdomCooper Controls Limited
    
    United KingdomCooper Crouse-Hinds (LLC)
    
    Dubai, UAECooper Crouse-Hinds (UK) Ltd.
    
    United KingdomCooper Crouse-Hinds AS
    
    NorwayCooper Crouse-Hinds B.V.
    
    NetherlandsCooper Crouse-Hinds GmbH
    
    GermanyCooper Crouse-Hinds Korea Ltd.
    
    KoreaCooper Crouse-Hinds Pte. Ltd.
    
    SingaporeCooper Crouse-Hinds, LLC
    
    Delaware, U.S.Cooper Crouse-Hinds, S.A.
    
    SpainCooper Crouse-Hinds, S.A. de C.V.
    
    MexicoCooper Csa Srl
    
    ItalyCooper Electric (Shanghai) Co., Ltd.
    
    ChinaCooper Electrical Australia Pty. Limited
    
    AustraliaCooper Electrical International, LLC
    
    Delaware, U.S.Cooper Electronic Technologies (Shanghai) Co., Ltd.
    
    ChinaCooper Enterprises LLC
    
    Delaware, U.S.Cooper Fulleon Limited
    
    United KingdomCooper Industries (Electrical) Inc.
    
    Ontario, CanadaCooper Industries Healthcare Solutions FZ-LLC
    
    Dubai, UAECooper Industries Holdings GmbH
    
    GermanyCooper Industries Mexico, S. de R.L. de C.V.
    
    MexicoCooper Industries Middle East, LLC
    
    Delaware, U.S.Cooper Industries Poland, LLC
    
    Delaware, U.S.Cooper Industries Russia LLC
    
    Russia
 2




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##### 



Name
    
    Incorporation
 B. ELECTRICAL PRODUCTS
 Cooper Industries South Africa, LLC
    
    Delaware, U.S.Cooper Industries (U.K.) Limited
    
    United KingdomCooper Lighting and Safety Limited
    
    United KingdomCooper Lighting de Mexico, S. de R.L. de C.V.
    
    MexicoCooper Lighting, LLC
    
    Delaware, U.S.Cooper MEDC Limited
    
    United KingdomCooper Menvier France SARL
    
    FranceCooper Mexico Distribucion, S. de R.L. de C.V.
    
    MexicoCooper Nature (Ningbo) Electric Co., Ltd.
    
    China(60% owned by Cooper (China) Co. Ltd.)Cooper Notification, Inc.
    
    Delaware, U.S.Cooper Power Systems do Brasil Ltda.
    
    BrazilCooper Power Systems Transportation Company
    
    WisconsinCooper Power Systems, LLC
    
    Delaware, U.S.Cooper Pretronica Lda.
    
    PortugalCooper Safety B.V.
    
    NetherlandsCooper Safety Limited
    
    United KingdomCooper Securite S.A.S.
    
    FranceCooper Security Limited
    
    United KingdomCooper Shanghai Power Capacitor Co., Ltd.
    
    China(65% owned by Cooper (China) Co., Ltd.)Cooper Technologies Company
    
    Delaware, U.S.Cooper Univel S.A.
    
    Delaware, U.S.Cooper Wheelock, Inc.
    
    New Jersey, U.S.Cooper Wiring Devices de Mexico, S.A. de C.V.
    
    MexicoCooper Wiring Devices Manufacturing, S. de R.L. de C.V.
    
    MexicoCooper Wiring Devices, Inc.
    
    New York, U.S.Cooper Xian Fusegear Co., Ltd.
    
    ChinaCrompton Lighting Holdings Limited
    
    United KingdomCrompton Lighting International Limited
    
    United KingdomCrompton Lighting Investments Limited
    
    United KingdomCTIP Inc.
    
    Delaware, U.S.Cyme International T & D Inc.
    
    Quebec, CanadaDigital Lighting Co., Limited
    
    Hong KongDigital Lighting Holdings Limited
    
    British Virgin Islands(50% held
by Alpha Lighting, Inc. and 20%
held by Cooper Offshore Holdings Ltd.)Dongguan Cooper Electronics Co. Ltd.
    
    ChinaDongguan Wiring Devices Electronics Co., Ltd.
    
    ChinaElectromanufacturas, S.A. de C.V.
    
    MexicoElpro International Pty Ltd.
    
    AustraliaElpro Technologies LLC
    
    California, U.S.Elpro Technologies Pty. Limited
    
    AustraliaG&H Technology, Inc.
    
    Delaware, U.S.GeCma Components Electronic GmbH
    
    GermanyGeCma International Limited
    
    United KingdomGS Metals Corp.
    
    Delaware, U.S.HITech Instruments Limited
    
    United KingdomIluminacion Cooper de las Californias, S. de R.L. de C.V.
    
    Mexico
 3




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##### 



Name
    
    Incorporation
 B. ELECTRICAL PRODUCTS
 Industrias Royer, S.A. de C.V.
    
    MexicoMcGraw-Edison Development Corporation
    
    Delaware, U.S.Measurement Technology Limited
    
    United KingdomMenvier Overseas Holdings Limited
    
    United KingdomMTL Canada Safety Instrumentation
    
    Ontario, CanadaMTL Incorporated
    
    Virginia, U.S.MTL Instruments (Shanghai) Co. Ltd
    
    ChinaMTL Instruments BV
    
    NetherlandsMTL Instruments GmbH
    
    GermanyMTL Instruments Inc.
    
    Delaware, U.S.MTL Instruments KK
    
    JapanMTL Instruments Private Ltd
    
    IndiaMTL Instruments Pte Ltd
    
    SingaporeMTL Instruments Pty Limited
    
    AustraliaMTL Instruments SARL
    
    FranceMTL Italia Srl
    
    ItalyMTL Partners Inc.
    
    Delaware, U.S.MTL Partners Inc. II
    
    Delaware, U.S.Ocean Technical Systems Limited
    
    United KingdomOceantech Limited
    
    United KingdomOmnex Control Systems ULC
    
    Alberta, CanadaPCV Incorporated
    
    Delaware, U.S.Ping Ding Shan Edison Power Systems Company Limited
    
    ChinaRoam Secure, Inc.
    
    Delaware, U.S.RL Manufacturing SDN BHD
    
    MalaysiaRTE Far East Corporation
    
    TaiwanRTK Instruments Limited
    
    United KingdomRTK Instruments LLC
    
    New Jersey, U.S.Scantronic Benelux BV
    
    NetherlandsScantronic Holdings Limited
    
    United KingdomScantronic International Limited
    
    United KingdomSilver Light International Limited
    
    British Virgin IslandsSilver Victory Hong Kong Limited
    
    Hong KongSirius Industries, Inc.
    
    Delaware, U.S.Standard Automation and Control LP
    
    Delaware, U.S.Sure Power, Inc.
    
    Oregon, U.S.The MTL Instruments Group Limited
    
    United KingdomThomas A. Edison Research & Development Center (Shanghai) Co, Ltd.
    
    ChinaViking Electronics, Inc.
    
    Delaware, U.S.WPI-Boston Division, Inc.
    
    Massachusetts, U.S.
 4




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##### 



Name
    
    Place of
Incorporation
 TOOLS & HARDWARE
 Airetool and Yost Superior Realty, Inc.
    
    Ohio, U.S.(50% owned by Cooper Tools, Inc.)Collins Associates Ltd.
    
    British Virgin IslandsCooper (Great Britain) Ltd.
    
    United KingdomCooper Brands, Inc.
    
    Delaware, U.S.Cooper Industries (Canada) Company
    
    Nova Scotia, CanadaCooper Industries (Canada) Inc.
    
    Ontario, CanadaCooper Industries Australia Pty Limited
    
    AustraliaCooper Industries France SARL
    
    FranceCooper Industries GmbH
    
    GermanyCooper Industries, LLC
    
    Delaware, U.S.Cooper Italia S.r.l.
    
    ItalyCooper Power Tools GmbH & Co. OHG
    
    GermanyCooper Power Tools GmbH Beteiligungen
    
    GermanyCooper Power Tools S.A.S.
    
    FranceCooper Tools B.V.
    
    NetherlandsCooper Tools de Mexico, S. de R.L. de C.V.
    
    MexicoCooper Tools GmbH
    
    GermanyCooper Tools Hungaria Kft.
    
    HungaryCooper Tools Industrial Ltda.
    
    BrazilCooper Tools International, LLC
    
    Delaware, U.S.Cooper Tools Manufacturing, S. de R.L. de C.V.
    
    MexicoCooper Tools Pty. Limited
    
    AustraliaCooper Tools S.A.S.
    
    FranceCooper Tools, Inc.
    
    Delaware, U.S.Deutsche Gardner-Denver Beteiligungs GmbH
    
    GermanyEmpresa Andina de Herramientas S.A.
    
    ColombiaErem S.A.
    
    SwitzerlandFiltronic AB
    
    SwedenLufkin Europa B.V.
    
    NetherlandsMetronix Messgerate und Elektronik GmbH
    
    GermanySociete Civile Immobiliere PRECA
    
    FranceSociete Civile Immobiliere R.M.
    
    FranceThe Cooper Group, Inc.
    
    Delaware, U.S.
 5




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##### 



Name
    
    Place of
Incorporation
 INACTIVE SUBSIDIARIES
 B & S Fuses Limited
    
    United KingdomBlessing International B.V.
    
    NetherlandsBrownly-Consultadoria e Projectos Lda
    
    Madeira Free ZoneClarity Lighting Ltd.
    
    United KingdomCooper Industries Finance B.V.
    
    NetherlandsCooper Industries Foreign Sales Company, Limited
    
    BarbadosCooper Investment Group. S a.r.l.
    
    LuxembourgCooper Power Tools B.V.
    
    NetherlandsCooper Thailand, LLC
    
    Delaware, U.S.Crouse-Hinds de Venezuela, C.A.
    
    VenezuelaDFL Fusegear Limited
    
    United KingdomDimmers Direct Limited
    
    United KingdomDynalite International Limited
    
    United KingdomDynalite Limited
    
    United KingdomEagle Electric MFG. Co. Mexico, S.A. de C.V.
    
    MexicoEMC Datacare Limited
    
    United KingdomFirecom Limited
    
    United KingdomFittings Images Technology Limited
    
    United KingdomFotadvise (M.E.W.) Limited
    
    United KingdomGardner-Denver International, C.A.
    
    VenezuelaHomelink Telecom Limited
    
    United KingdomiControl Limited
    
    United KingdomiLight Group Limited
    
    United KingdomiLight Limited
    
    United KingdomIntelligent Lighting, Ltd.
    
    United KingdomJ S B Electrical Limited
    
    United KingdomKestron Units Limited
    
    United KingdomLED Storm Limited
    
    United KingdomLight Processor Limited
    
    United KingdomLight Sound Image Systems Limited
    
    United KingdomLightfactor Contracts Limited
    
    United KingdomLightfactor Sales Limited
    
    United KingdomLightomation Limited
    
    United KingdomManufacturing Electrical Design Consultants Limited
    
    United KingdomMarata Group Limited
    
    United KingdomMenvier Limited
    
    United KingdomMenvier Security Limited
    
    United KingdomMercury Switch Manufacturing Company Limited
    
    United KingdomMSG Leasing Limited
    
    United KingdomMTL Instruments Limited
    
    United KingdomMTL Instruments (NZ) Ltd
    
    New ZealandMTL Limited
    
    United KingdomMTL Safety Systems Limited
    
    United KingdomMTL Surge Protection Limited
    
    United KingdomMTL Systems (Aust) Pty Limited
    
    AustraliaMTL Systems Limited
    
    United Kingdom
 6




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##### 



Name
    
    Incorporation
 INACTIVE SUBSIDIARIES
 Nelco Systems Limited
    
    United KingdomNext Loudspeakers Limited
    
    United KingdomNext Two (International) Limited
    
    United KingdomNext Two Limited
    
    United KingdomPolaron Communications Limited
    
    United KingdomPolaron Components Limited
    
    United KingdomPolaron Controls Limited
    
    United KingdomPolaron Cortina Limited
    
    United KingdomPolaron Engineering Limited
    
    United KingdomPolaron Entropics Limited
    
    United KingdomPolaron Manufacturing Limited
    
    United KingdomPolaron Schaevitz Limited
    
    United KingdomRegalsafe Limited
    
    United KingdomRLS Incorporated
    
    Delaware, U.S.Rossula Limited
    
    United KingdomSave Fusetech Inc.
    
    KoreaScantronic Limited
    
    United KingdomSi-Tronic Srl (49% owned by Scantronic International Limited)
    
    ItalyTelematic Limited
    
    United KingdomTelematic Systems Limited
    
    United KingdomTransmould Limited
    
    IrelandZeck Audio U.K. Limited
    
    United KingdomZero 88 Lighting Limited
    
    United Kingdom
 7