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A 1925 patented Ross single pin (cog) cam-and-lever steering was popular on Dodge, Graham-Paige, Reo, and Mack trucks. Ross built cam-and-lever steering gears as late as 1971. In their best form, the heavy-duty truck versions of these gears had twin studs that rotated on double-tapered roller bearings. I-H, Studebaker, and others used Ross gears.