Current Members
To report changes to your contact infomation as listed in the Current Members list, click here or send an email to Membership@HTRI.net
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OAO “VNIPIneft”
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Officine LUIGI RESTA S.p.A.
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Ohmstede Ltd.
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Oil and Gas Equipment Industries
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Oilfields Supply Center Ltd.
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Oilserv Oilfield Services (BVI) Ltd.
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"Oktyabrskhimmash" LLC
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Olayan Descon Engineering Company
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Onda S.p.A.
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OOO ThyssenKrupp Industrial Solutions (RUS)
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Operadora CICSA, S.A. de C.V.
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Optimus Industries, LLC
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OQ Chemicals Bishop LLC
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OQ Chemicals Corporation
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Oriental Union Chemical Corporation
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ORLEN Projekt S.A.
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Ormat Systems Ltd.
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Osaka International Refining Company, Limited
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OT Industries Engineering Co., Ltd.
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