Original oil and gas trade magazine vintage ad for MAGNET COVE BARIUM CORPORATION of Houston, TX. Magcobar Dealer waits up every night ready to serve you. The next time you need mud, whether it is a routine order or a midnight emergency, look for one of the Magcobar dealers located with respect to drilling activity. This unique 1950 old oilfield petroleum well industry magazine advertisement would display beautifully matted and framed. Nice graphics.