Original oil and gas trade magazine vintage ad for DOW CHEMICAL COMPANY, of Midland, MI. Magnesium Anodes, When Conditions Are Tough, GALVOMAG Protection is Best! Distributors were: Cathodic Protection Service, Houston, TX. Corrosion Sergifces, Inc., Tulsa, OK. Electro-Rustproofing Corp, Belleville, NJ. Royston Laboratories, Inc., Blawnox, PA. Stuart Steel Protection Corp., Kenilworth, NJ. and The Vanode Company, Pasadena, CA. Unique 1955 old oilfield petroleum pipe protection industry magazine advertisement, Approximate size 9 x 12 inches.