Original oil and gas trade magazine vintage ad for McNAMAR BOILER & TANK COMPANY of Tulsa, OK. Expanded Pipe 26 inches in diameter and up. High quality, electric welded, expanded, and machine beveled, fabricated in accordance with the latest API specifications. The photo shows the hydraulic expander, which produces pipe in a true finish diameter. This unique 1950 old oilfield petroleum pipe and pipeline industry equipment magazine advertisement would display beautifully matted and framed. Nice graphics.