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Definitely not Moseley. It was JF Cusson. To be exact, the first time he did it in a comp was at the Canadian Junior Nationals in March 1996 at Le Relais, Quebec. JP Auclair and others followed shortly thereafter. There were TONS of mogul skiers who were doing 3 mutes between 1996 and the 1998 Nagano Games.
OK.... JF has been doin it forever, but not in competition..... Julien did it in the Nagano Olympics, but got like 13th place, or something horrible... then Moseley did it and the world sucked him off, gave him TV shows, and money, etc.