Original oil and gas trade magazine vintage ad for ROCKWELL MANUFACTURING COMPANY. Main office and plant was located in Pittsburgh, PA. Sturdy Sentinels of Security. On guard over the skyline of Houston, Texas, stands the sturdy Rockwell High Pressure Balanced Valve regulator. Quick operating, positive acting Nordstrom valves complete a picture of gas line security that gives the rightful impression of better service and protection from the use of the finest, safest equipment. This unique 1954 old two-sided petroleum oilfield valve equipment magazine advertisement would display beautifully matted and framed.