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Petróleo Brasileiro S.A. é uma empresa de capital aberto, cujo acionista majoritário é o Governo do Brasil, sendo, portanto, uma empresa estatal de economia mista.
Econo is a Nepean, ON-based company in the Energy & Utilities sector.
Abraxas Petroleum Corporation is a San Antonio, TX-based company in the Energy and Utilities sector.
Unitech Energy Resources Inc. engages in the exploration and development of petroleum and natural gas properties in Western Canada