Shell Oil Company is the United States-based wholly owned subsidiary of Royal Dutch Shell, a transnational corporation "oil major" of Anglo-Dutch origins, which is amongst the largest oil companies in the world.
Sonic Connectors has manufactured feed thru systems for the oil industry for 3 years.
Nelson Petroleum is a Everett, WA-based company in the Energy and Utilities sector.
Netherland, Sewell and Associates is a Dallas, TX-based company in the Energy and Utilities sector.