Original oil and gas trade magazine vintage ad for THE WILLIAM POWELL COMPANY, of Cincinnati, OH. Valves in the Petroleum Panorama. Powell engineers and metallurgists will gladly make a careful analysis of your flow control problems and submit their recommendations for your particular requirements. Models 2491, 375, 3061a, 6003,2453SG, 3059G, 2475, and 2201 valves are shown. Birds-Eye View of plant. This unique 1959 two-page gatefold petroleum oilfield wellhead equipment magazine advertisement would display beautifully matted and framed.