Original oil and gas trade magazine vintage ad for TWIN DISC CLUTCH COMPANY. of Racine, WI. Put this Hydraulic Torque Converter in your Design. More than 44 different models to choose from. Whether it is an independent rotary drive like the sketch shown, or a heavy duty drilling rig involving multiple engines, you will find our converters offer the greatest overall torque multiplication. This unique 1950 old petroleum oilfield drilling equipment industry magazine advertisement would display beautifully matted and framed.