Original oil and gas trade magazine vintage ad for MID-CONTINENT SUPPLY COMPANY. Main office was located in the Mid-Continent Building, Fort Worth, Texas. There's Economy at the Heart of the Rig. The U-36-A Unit Rig drawworks provides economy because it is engineered for fast drilling, extra depth capacity and convenient rig moves. The worlds largest independent oilfield supply company. This unique 1957 old oilfield petroleum drilling equipment magazine advertisement would display beautifully matted and framed. Nice graphics.