Original oil and gas trade magazine vintage ad for NATIONAL LEAD COMPANY of Houston, TX. Baroid Division. Emulsion mud increases drilling rates. Reduces drill pipe torque from 15 to 40 percent, protects productive zones against filtrate invasion. Compounded to meet practically every drilling condition. Unequaled facilities have continuously served your requirements during periods of peacetime industrial development and peak wartime demand. This unique 1953 old two-sided oilfield petroleum drilling industry magazine advertisement would display beautifully matted and framed.