Original oil and gas trade magazine vintage ad for OKLAHOMA CONTRACTING CORPORATION of Dallas, TX. The Laying of The Ajax Double 10 Inch and the Panhandle-Eastern 22-24 Inch Made Pipe Line History in 1930. Pictured is the railroad crossing of Ajax Double 10 inch Line at Wood River, IL, Crossing the Missouri River, and the Line under construction near Gruver, Texas. Formerly Oklahoma Contracting Company. Pipe Line Engineers and Contractors. This unique 1931 old petroleum oilfield pipeline industry equipment magazine advertisement would display beautifully matted and framed.