Exhibit 21.1

COOPER CAMERON CORPORATION — SUBSIDIARIES & JOINT VENTURES
(Active As of December 31, 2005)

	% Owned						State/Country of
	By			% Owned			Incorporation or
Cooper Cameron Corporation (Delaware) — Parent	Subsidiary			By CCC			Organization
1 - Cameron Algerie (1 share owned by CCPEGI)					100	%	Algeria
1 - Cameron Al Rushaid Ltd.					50	%	Saudi Arabia
1 - Cameron Argentina S.A.I.C. (122,700 shares owned by CCPEGI)	Less than 1%				100	%	Argentina
1 - Cameron Gabon, S.A. (1 share owned by Chairman)					100	%	Gabon
1 - Cameron Offshore Systems Nigeria Limited					100	%	Nigeria
1 - Cameron Services Middle East LLC (Joint Venture)					24	%	Oman
1 - Cameron Venezolana, S.A. — (51% owned by CCPEGI)					100	%	Venezuela
2 - Cameron Remanufacturas, C.A.		100	%				Venezuela
1 - Cameron Angola — Prestaçao de Serviços, Limitada — (1 share owned by CCPEGI)					100	%	Angola
1 - Compression Services Company					100	%	Ohio, USA
1 - Cooper Cameron Foreign Sales Company Ltd.					100	%	Barbados
1 - Cooper Cameron International Holding Corp. (CESI has partial interest)		8.36	%		91.64	%	Nevada, USA
2 - Cooper Cameron Holding (Cayman) Limited		100	%				Grand Cayman
3 - Cameron Australasia Pty. Ltd.		100	%				Australia
4 - Cooper Cameron Valves Australia Pty. Ltd.		100	%				Australia
3 - Cooper Cameron Campex Limited		80.1	%				Grand Cayman
4 - ShanDong Cooper Cameron Petroleum Equipment Pte Ltd (10-12-2004)		100	%				China
3 - Cooper Cameron do Brasil Ltda. (1 share owned by CC (Lux) SARL)		100	%				Brazil
4 - On/Off Manufatura e Comercio de Vavulas Ltda.		100	%				Brazil
3 - Cooper Cameron (Trinidad) Limited		100	%				Trinidad and Tobago
3 - Cooper Cameron (Gibraltar) Limited		100	%				Gibraltar
4 - Cooper Cameron Holding (Luxembourg) SARL		100	%				Luxembourg
5 - Cooper Cameron (Luxembourg) SARL		100	%				Luxembourg
6 - Cameron GmbH		100	%				Germany
6 - Cooper Cameron Valves Italy Srl.		100	%				Italy
6 - Cameron Ireland Limited		100	%				Ireland
6 - Dresser Flow Solutions Trading e Servicos LDA		55	%				Portugal
7 - Dresser Flow Solutions (Nigeria Limited)		70	%				Nigeria
6 - Cooper Cameron Netherlands B.V. (11-2004)		100	%				Netherlands
7 - CCC Euro Automation Center BV		100	%				Netherlands
7- Sterom S.A.		100	%				Romania
6- Cooper Cameron Holding (Dutch) B.V.		100	%				Netherlands
7- Cooper Cameron Canada Corporation		100	%				Canada/Nova Scotia
8 - Ed’s Wellhead Supply (2005) Ltd.		100	%				Canada/Alberta
8 - St. Clair Valve Techniques Limited		100	%				Canada/Ontario
6 - Cooper Cameron Holding (U.K.) Limited		100	%				United Kingdom
7 - Cameron France, S.A.S.		100	%				France
7 - Cooper Cameron (U.K.) Limited		100	%				United Kingdom
8 - Cooper Cameron (U.K.) Investments Limited		100	%				United Kingdom
9 - Flow Link Systems Private Ltd.		45.5	%				India
9 - Nutron Manufacturers (India) Private Limited		100	%				India
9 - Flow Control-Tati Production Sdn. Bhd.		49	%				Malaysia
9 - Nutron Flow Control International (Malaysia) Sdn. Bhd.		100	%				Malaysia
8 - Cameron Offshore Engineering Limited		100	%				United Kingdom
8 - Cooper Cameron Pensions Limited		100	%				United Kingdom
8 - Cameron Integrated Services Limited		100	%				United Kingdom
8 - International Valves Limited		100	%				United Kingdom
7 - Cooper Cameron Holding B.V.		100	%				Netherlands
8 - Cooper Energy Services B.V.		100	%				Netherlands
8 - Cameron B.V.		100	%				Netherlands
8- Cooper Cameron Holding (Norway) AS		100	%				Norway
9 - Cameron Norge AS		100	%				Norway

1

	% Owned						State/Country of
	By			% Owned			Incorporation or
Cooper Cameron Corporation (Delaware) — Parent	Subsidiary			By CCC			Organization
3 - Cooper Cameron (Singapore) Pte. Ltd.		100	%				Singapore
4 - Riyan Cameron (B) Sendirian Berhad		100	%				Brunei
1 - Cooper Cameron (Holding) Corp.					100	%	Nevada, USA
2 - Cooper — Texgas Ltd. (1 share owned by Compression Services Co.)		50	%				Colombia
2- NuFlo Technologies, Inc.		100	%				Delaware, USA
3 - Nuflo Technologies Canada Ltd.		100	%				Alberta, CA
3 - Barton Instrument Systems Limited		100	%				England & Wales
3 - NuFlo Finance and Royalty Company		100	%				Delaware, USA
3 - NuFloTechnologies Sales Company		100	%				Delaware, USA
1 - OPE, Inc.					33	%	Texas, USA
1 - OPE International, L.P.					33	%	Texas, USA
1 - Sequel Holding, Inc.					100	%	Delaware, USA
1 - Petreco International Inc. (partially owned by Sequel Holding, Inc.)		51	%		49	%	Delaware, USA
2 - Petreco-KCC Holding, Inc.		100	%				Delaware, USA
3 - Petreco-KCC Limited		100	%				United Kingdom
2 - Petreco International Limited		100	%				United Kingdom
3 - KCC Group Limited		100	%				United Kingdom
4 - Petreco International (Middle East) Limited		100	%				United Kingdom
4 - KCC Process Equipment Limited		100	%				United Kingdom
5 - RJB Engineering (UK) Limited		100	%				United Kingdom
4 - KCC Resources (Jersey) Limited		100	%				Jersey
2 - Petreco Canada Inc.		100	%				Canada/Alberta
1 - Cooper Cameron Corporation Nigeria Limited					60	%	Nigeria
1 - Cooper Cameron S.R.L.					100	%	Italy
1 - Cooper Energy Services de Venezuela, S.A.					100	%	Venezuela
1 - Cooper Energy Services International, Inc. (CESI)					100	%	Ohio, USA
2 - Canada Tiefbohrgeräte und Maschinenfabrik GmbH (1 share owned by CCPEGI)		100	%				Austria
1 - Cooper Cameron de Mexico S.A. de C.V. (1 share owned by CCPEGI)					100	%	Mexico
1 - Cooper Cameron Petroleum Equipment Group, Inc. (CCPEGI)					100	%	Delaware, USA
1 - Cooper Turbocompressor, Inc.					100	%	Delaware, USA
1 - Wellhead Services, Inc.					100	%	Nevada, USA
2 - Cooper Cameron (Malaysia) Sdn Bhd**		49	%				Malaysia
3 - Cooper Cameron Valves Singapore Pte. Ltd.		100	%				Singapore
4 - Cooper Cameron Corporation Sdn Bhd		70	%				Malaysia
4 - PCC Bumi Flow Technologies Sdn. Bhd.		49	%				Malaysia

**	Local Malaysian law requires that a majority of stock be owned by local residents.
Attorney/agents hold 51% of stock on CCC’s behalf.

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