Original oil and gas trade magazine vintage ad for MAGNET COVE BARIUM CORPORATION. Magcobar Drilling Mud Service. A Dresser Industries company Main office and factory was located in Houston, TX. The Best Equipped Dealer Organization in the Field. Unique 1955 old oilfield petroleum drilling industry magazine advertisement. Great graphics. On the reverse side is an ad for THE GATES RUBBER COMPANY of Denver, CO. Gates Vulco Rope Drives - World's Largest maker of V-Belts. Old 1955 oilfield petroleum drilling industry magazine advertisement. Approximate size 9 x 12 inches.