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Petroleum Helicopters International, Inc., is an American commercial helicopter operator, founded in 1949, by Robert L.
Kelley-Williamson Company is a Rockford, IL-based company in the Energy & Utilities sector.
Turnaround Management Co is a Houston, TX-based company in the Energy and Utilities sector.
Walworth is a Stafford, TX-based company in the Energy and Utilities sector.
NOV Inc. is an American multinational corporation based in Houston, Texas.