1954 – Square Walking Wheel – Albert Sfredda (American)
Source: Popular Mechanics, April 1970. 1- SQUARE WHEELS WORK BETTER than round ones in this system for use on rough terrain- The sharp-cornered treads dig in on snow, mud, sand or steep grades, providing increased traction for trucks, tanks and other military vehicles. At the same time, ingenious self-leveling geometry provides a smooth ride on …
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