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Frontier Energy Services is a Tulsa, OK-based company in the Energy and Utilities sector.
The Elexco Group is a London, ON-based company in the Energy & Utilities sector.
Parker Boiler Company is a Los Angeles, CA-based company in the Energy and Utilities sector.
Walter Oil and Gas Corporation is a Houston, TX-based company in the Energy and Utilities sector.
It produces, refines and markets oil products and provides engineering services, as well as licensing production technologies.