at state fairs. This was the first fuel-cell-powered vehicle. Potassium hydroxide served as the electrolyte. The original AC fuel cell tractor is currently on display at the Smithsonian. Below is a gallery showcasing some of the models that Allis-Chalmers produced throughout its history, most of which are painted in their distinctive orange paint. Balers The first model introduced in 1947 was called the "Roto-Baler" and the fore-runner of modern round balers, albeit with much smaller bales. The Roto-Baler had a production run from 1947-1964 and then again from 1972-1974. Allis Chalmers also built many small square baler models. Combine Harvesters Allis-Chalmers originally developed their pull-type "all-crop harvester" as their solution for growers to harvest their crops beginning in 1933. In 1955, Allis-Chalmers acquired the Gleaner Baldwin/Gleaner Manufacturing Company and its line of self-propelled combine harvesters. Industrial Construction Equipment The company produced several lines of earth-moving and construction equipment ranging from: Road graders Tracked bulldozers Tracked loaders Forklifts Others Industrial and power house equipment Allis Chalmers marketed a full line of Industrial and Power House equipment, including turbo generators and medium voltage switchgear. In the 1920s through the 1960s AC Power House and Industrial equipment was competitive with industry giants like General Electric and Westinghouse. As early as the 1920s AC was manufacturing multi MVA hydro-electric generators and turbines, many of which remain in service today (Louisville Gas & Electric Ohio Falls units 1–8, 8MW low head turbines and Kentucky Utilities Dix Dam units 1–3, 11MVA 300 RPM generators). Allis Chalmers manufactured several lines of medium voltage switchgear, such as the HF and MA lines. The HF line competed with the General Electric "AM" Magneblast line of vertical-lift medium-voltage switchgear. The MA line was a competitor of the ITE "HK" line of horizontal-racking medium-voltage switchgear. Allis-Chalmers produced a line of substation transformers, voltage regulators, and distribution transformers. Allis Chalmers, during the period 1930–1965 and beyond, manufactured and marketed an extensive line of ore crushing equipment for the mining industry In 1965, Allis-Chalmers built "Big Allis," or Ravenswood No. 3, the biggest generator in New York. It is located in Queens, and has an output of 1000 MW. It is operational today. Lawn and outdoor machinery In the late 1960s and early 1970s AC expanded into lawn and out-door equipment. All-terrain vehicles AC made a line of 6-wheeled Amphibious ATV's called the "Terra Tiger". Fuel cell golf carts In 1965, Allis-Chalmers built