Original oil and gas trade magazine vintage ad for WESTERN SUPPLY COMPANY of Tulsa, OK. Selective Service, aromatics to aspirin. Benzene and Toluene currently produced at Cosden Petroleum Corporation's Big Spring, Texas refinery so greatly exceeded the purity requirements of the ASTM Nitration Grade specifications, that these products are now being used directly in the manufacture of pharmaceuticals such as aspirin and cortisone. Western heat exchangers perform an important service in the conservation and transfer of heat during the selective extraction of these aromatic hydrocarbons. This unique 1959 old petroleum and petrochemical refining process industry equipment magazine advertisement would display beautifully matted and framed.