Original vintage oil and gas trade magazine ad for the WISCONSIN MOTOR CORPORATION, of Milwaukee, WI. 50 Years of Wisconsin Engine Progress. World's Largest Builders of Heavy Duty Air cooled Engines. Model THPD Oil Well Pumping Engine with High Momentum Factor, Model VR4D Engine, Model THPD Wisconsin Air Cooled Oil Well Pumping Engine. Old 1959 petroleum industry advertisement. Would look sensational matted and framed!