Original oil and gas trade magazine vintage ad for HUGHES TOOL COMPANY of Houston, TX. Heavily Studded with Tungsten Carbide, the 3-Cone Hughest bits provide your best assurance of maintaining full gage hole all the way. Cuts Down Those Costly Round Trips. Unique 1955 old oilfield petroleum drilling industry equipment magazine advertisement. On the reverse side is an ad for DOWELL INCORPORATED, of Tulsa, OK. Subsidiary of the Dow Chemical Company. Acid Petrofrac Dowell Double-Duty Treatment Boosts Flow Two Ways - Fractures and Aciidizes in Single Operation. Dowell Service brings you well treatments, job-tailored to your well conditions. Unique 1955 old oilfield petroleum well drilling industry magazine advertisement. Approximate size 9 x 12 inches.