Original oil and gas trade magazine vintage ad for T. D. WILLIAMSON, INC. of Tulsa, OK. WmSON Concentric Support Insulators and WmSeal Casing Bushings Low Cost Plus Engineered Design give Lasting Economy. For your Highway and Railroad Pipe Line Crossing Jobs. Representatives were in Houston, TX., Pittsburgh, PA., Kenilworth, NJ., Amarillo, TX., Casper, WY., Provo, UT., Joliet, Los Angeles, CA., San Francisco, CA., Bartlesville, OK., Edmonton, AB., London, Ontario, Calgary, Buenos Aires, Durban, Natal, and South Africa. Unique 1955 old petroleum oilfield pipeline industry equipment magazine advertisement. Approximate size 9 x 12 inches.