Original oil and gas trade magazine vintage ad for HOUDRY PROCESS CORPORATION. Main office was located 1528 Walnut Street, in Philadelphia, PA. Nowhere Else Can You Get Such Catalytic Processing Efficiency. For highest product yields at lowest costs ,Houdriflow - Catalytic Cracking. This unique 1954 petroleum refining process industry magazine advertisement would display beautifully matted and framed. Two page gatefold advertisement.