Original oil and gas trade magazine vintage ad for MAGNET COVE BARIUM CORPORATION of Houston, TX. One of the Dresser Industries. MagCoBar drilling mud has become a science all its own. History records, and many old timers confirm, that mud used in the Spindletop well was actually siphoned from a near by mudhole, agitated by cows wallowing and trampling through the mire. The carefully compounded and controlled muds used in deep Gulf Coast wells today are a far cry from the earth and water muds used in early discovery wells. This unique 1951 old oilfield petroleum well drilling magazine advertisement would display beautifully matted and framed. Two page gatefold advertisement.