Plagiarism
In the early 1970s, Poppen organized snurfing competitions at the Michigan ski resort that attracted fans from all over the country. One of them was Tom Sims, a skateboard lover, who made a snowboard at school when he was in eighth grade in Haddonfield, New Jersey, back in 1960. His idea was to upholster the top of a piece of wood and fix an aluminum sheet at the bottom that, later, in the mid-1970s produced and commercialized. At the same time, Dimitrije Milovich, a surf enthusiast who used the trays of the university cafeteria to slide through the snow, built a snowboard called "Winterstick" inspired by conventional surfboards. Several articles on Winterstick tables in major magazines in the country helped publicize this young sport.
Source: https://prezi.com/4qrtifxsiepf/snowborarding/