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Exhibit 21.1


SUBSIDIARIES OF THE REGISTRANT


State or Country ofName
    
    IncorporationAckerman International Holland B.V.
    
    NetherlandsAdvanced Wirecloth, Inc.
    
    LouisianaAmclyde UK Limited
    
    United KingdomBlack Max Argentina S.A.
    
    ArgentinaBowen Downhole LLC
    
    DelawareBowen Downhole, Inc.
    
    DelawareBrandt Energy Environmental, L.P.
    
    TexasBrandt Interests, Inc.
    
    DelawareBrandt Norge
    
    NorwayBrandt Oilfield Services (M) Sdn. Bhd.
    
    MalaysiaBrandt Servicios Petroleros S.A.
    
    PeruChurch Oil Tools, Inc.
    
    TexasCoil Services (North Sea) Limited
    
    United KingdomCoil Services ME LLC
    
    United Arab EmiratesCorlac Equipment Corp
    
    BarbadosCTES, Ltd.
    
    United KingdomDreco DHT, Inc.
    
    DelawareDreco Eastern Europe Ltd.
    
    AlbertaDreco Energy Services Ltd.
    
    AlbertaDreco Europe Limited
    
    United KingdomDreco International Finance (Barbados) Ltd.
    
    BarbadosDreco International Holdings Ltd.
    
    AlbertaDreco Limited
    
    United KingdomDreco LLC
    
    DelawareDrexel Oilfield Services (Middle East) L.L.C.
    
    United Arab EmiratesElmar Far East Pty Ltd
    
    AustraliaElmar Services (Middle East) Limited
    
    United KingdomElmar Services Pty Ltd
    
    AustraliaEnvironmental Procedures Inc.
    
    DelawareFiber Glass Systems (Harbin) Co., Ltd.
    
    ChinaFiber Glass Systems Holdings, LLC
    
    DelawareFiber Glass Systems, L.P.
    
    TexasGriffith Downhole Products GmbH
    
    GermanyHarbin Star Fiberglass Ltd.
    
    ChinaHebei Huayouyiji Tuboscope Coating Co., Ltd.
    
    ChinaHerramientas Varco, S.A. de C.V.
    
    MexicoHITEC AS
    
    NorwayHydralift Amclyde, Inc.
    
    DelawareHydralift AS
    
    NorwayHydralift BLM SA
    
    FranceHydralift France SAS
    
    FranceHydralift Holding UK Ltd.
    
    United KingdomInspecciones y Pruebas No Destructivs, S.A. de C.V.
    
    MexicoJiangyin Tuboscope Tubular Development Co., Ltd
    
    ChinaJV FIDMASH
    
    BelarusLanzhou LS-National Oilwell Petroleum Engineering Co. Ltd.
    
    China




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State or Country ofName
    
    IncorporationLLTT, Ltd.
    
    Trinidad And TobagoLSI Asia Pacific Pte. Ltd.
    
    SingaporeM.S.D. de Venezuela, C.A.
    
    VenezuelaMolde Produksjonssenter AS
    
    NorwayMono Group
    
    United KingdomMono Group Pension Trustees Limited
    
    United KingdomMono Pumps (Australia) Proprietary Limited
    
    AustraliaMono Pumps Ltd.
    
    United KingdomMono Pumps New Zealand Limited
    
    New ZealandMonoflo NOV S.A.I.C.
    
    ArgentinaNational Oilwell Algerie
    
    AlgeriaNational Oilwell de Mexico S.A. de C.V.
    
    MexicoNational Oilwell de Venezuela, C.A.
    
    VenezuelaNational Oilwell DHT, LP
    
    DelawareNational Oilwell do Brasil LTDA
    
    BrazilNational Oilwell France S.A.R.L.
    
    FranceNational Oilwell Middle East Company
    
    Nova ScotiaNational Oilwell Norway AS
    
    NorwayNational Oilwell Nova Scotia Company
    
    Nova ScotiaNational Oilwell Ontario, LLC
    
    DelawareNational Oilwell Poland S.p.z.o.o.
    
    PolandNational Oilwell Services de Mexico, S.A. de C.V.
    
    MexicoNational Oilwell Sogne AS
    
    NorwayNational Oilwell Varco Equipment Trading (Shanghai) Co., Ltd.
    
    ChinaNational Oilwell Varco Petroleum Equipment (Shanghai) Co., Ltd.
    
    ChinaNational Oilwell Varco UK Limited
    
    United KingdomNational Oilwell Varco, L.P.
    
    DelawareNational Oilwell-Netherlands B.V.
    
    NetherlandsNational-Oilwell Canada Ltd.
    
    AlbertaNational-Oilwell Pte. Ltd.
    
    SingaporeNational-Oilwell Pty. Ltd.
    
    AustraliaNatoil LLC
    
    DelawareNatoil, Inc.
    
    DelawareNBJ Manufacturas Petroleras (Bolivia) S.A.
    
    BoliviaNOV (Caymans), Ltd.
    
    Cayman IslandsNOV DH de Mexico S.A. de C.V.
    
    MexicoNOV Rigstore, Inc.
    
    DelawareNOV Sara India Private Limited
    
    IndiaNOV Sub, Inc.
    
    DelawareNOV UK Finance Limited
    
    United KingdomNOW (Asia), Inc.
    
    MauritiusNOW (Barbados) SRL
    
    BarbadosNOW Canada, L.P.
    
    AlbertaNOW Downhole Tools, Inc.
    
    DelawareNOW International Nova Scotia Company
    
    Nova ScotiaNOW International, Inc.
    
    DelawareNOW Nova Scotia Holdings, Inc.
    
    DelawareNOW Oilfield Services, Inc.
    
    DelawareNQL (Illinois) Inc.
    
    IllinoisNQL (US) Inc.
    
    DelawareNQL Energy Services (Barbados) Ltd.
    
    BarbadosNQL Energy Services US, Inc.
    
    TexasNQL Finance, L.L.C.
    
    DelawareNQL Holland B.V.
    
    Netherlands




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State or Country ofName
    
    IncorporationP&T Servicios Petroleros, C.A.
    
    VenezuelaPesaka Inspection Services SDN.BHD.
    
    MalaysiaPrescott Drilling Motors, Inc.
    
    LouisianaPretempca Servicios de Mexico, S.A. de C.V.
    
    MexicoProcon Engineering Ltd.
    
    United KingdomPT National Oilwell Varco
    
    IndonesiaSampwell Testing Services Ltd.
    
    AlbertaScreen Manufacturing Co. Ltd.
    
    Trinidad And TobagoServicios Tubulares TT, S.A. de C.V.
    
    MexicoServizi Ispettivi s.r.l.
    
    ItalyShaffer India Private Limited
    
    IndiaShanghai NOW-LS Engineering Consulting Co. Ltd.
    
    ChinaSmart Screen Systems, Inc.
    
    MinnesotaSoil Recovery A/S
    
    DenmarkSTAR Sudamtex Tubulares S.A. (Joint Venture)
    
    VenezuelaSTS Products Inc.
    
    DelawareTexas Oil Tools, Inc.
    
    NevadaThe Brandt Company de Argentina S.A.
    
    ArgentinaTS&M Supply
    
    AlbertaTS&M Supply - Ontario
    
    OntarioTS&M Technical Sales & Maintenance Company
    
    Nova ScotiaTube-Kote, Inc.
    
    TexasTubo-FGS, L.L.C.
    
    DelawareTuboscope & Co. LLC
    
    OmanTuboscope (Holding U.S.) Inc.
    
    DelawareTuboscope (Thailand) Limited
    
    ThailandTuboscope Brandt de Colombia
    
    ColombiaTuboscope Brandt de Venezuela S.A.
    
    VenezuelaTuboscope Holdings Limited
    
    United KingdomTuboscope Holdings UK Ltd.
    
    United KingdomTuboscope Mexico, S.A. de C.V.
    
    MexicoTuboscope Norge AS
    
    NorwayTuboscope Pipeline Services Canada Inc.
    
    AlbertaTuboscope Pipeline Services Inc.
    
    TexasTuboscope Pipeline Services Limited
    
    United KingdomTuboscope Services, L.L.C.
    
    DelawareTuboscope Servicios de Bolivia S.A.
    
    BoliviaTuboscope Vetco (Deutschland) GmbH
    
    GermanyTuboscope Vetco (France) S.A.
    
    FranceTuboscope Vetco (Osterreich) GmbH
    
    AustriaTuboscope Vetco Canada Inc.
    
    AlbertaTuboscope Vetco Capital Limited
    
    United KingdomTuboscope Vetco de Argentina S.A.
    
    ArgentinaTuboscope Vetco Mexico, S.A. de C.V.
    
    MexicoTuboscope Vetco Moscow
    
    Russian FederationTuboscope Vetco Nigeria Limited
    
    NigeriaTulsa Equipment Manufacturing Company
    
    OklahomaTVI Holdings, L.L.C.
    
    DelawareV.O.F. National Oilwell Varco
    
    NetherlandsVarco Al Mansoori Services Company LLC
    
    United Arab EmiratesVarco (Beijing) Co. Ltd.
    
    ChinaVarco BJ BV
    
    NetherlandsVarco BJ FSC Inc
    
    BarbadosVarco Canada Limited
    
    Alberta




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State or Country ofName
    
    IncorporationVarco CIS
    
    Russian FederationVarco do Brasil Ltda.
    
    BrazilVarco Drilling Equipment do Brasil Ltda.
    
    BrazilVarco I/P, Inc.
    
    DelawareVarco International de Venezuela, C.A.
    
    VenezuelaVarco International do Brasil Equipamentos e Servicos Ltda.
    
    BrazilVarco International Pte. Ltd.
    
    SingaporeVarco Norge AS
    
    NorwayVarco Sara (India) Private Limited
    
    IndiaVarco U.S. Holdings, Inc.
    
    DelawareVarco UK Acquisitions Limited
    
    United KingdomVarco US Finance, Inc.
    
    DelawareVarco, L.P.
    
    DelawareVCR Panama Inc.
    
    PanamaVector Oil Tool Ltd.
    
    AlbertaVenwell International Inc. (Trinidad Branch)
    
    TexasVersatech International Ltd.
    
    AlbertaVetco Coating GmbH
    
    GermanyVetco Enterprise AG
    
    SwitzerlandVetco Pipeline Services Ltd.
    
    AlbertaVetco Pipeline Services, Inc.
    
    TexasVetco Saudi Arabia Ltd.
    
    Saudi ArabiaVetco Services Sendirian Berhad
    
    Brunei DarussalamVetco Technology GmbH
    
    GermanyWelch Power Source, L.L.C.
    
    LouisianaWelch Sales & Service, Inc.
    
    LouisianaWoolley, Inc.
    
    TexasXST Holdings, Inc.
    
    Texas