Original vintage oil and gas magazine ad, T. D. WILLIAMSON INC. of Tulsa, OK. WmSonConcentric Support Insulators and WmSealCasing Bushings Low Cost Plus Engineered Design give Lasting Economy. "For your Highway and Railroad Crossing Jobs." Representatives 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, South Africa. Old 1955 petroleum pipe line industry advertisement.
Approximate size 9 x 12 inches.