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In page Jerry Toppazzini:

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On October 16, 1960, Toppazzini substituted for Boston goaltender Don Simmons, who was injured with thirty seconds left in a match against the Chicago Black Hawks, in which the Bruins were losing 5-2.[1] At the time, teams were not required to carry a backup goaltender on the bench, although they were required to have one available in the arena. Reportedly, Toppazzini did not want to wait for the Black Hawks' house goaltender to suit up.[2] He faced no shots in his brief stint.[3] By the 1965 playoffs, the NHL ruled that all teams must have a spare goaltender on the bench and ready to play.[4] Toppazzini is thus the last position player to substitute in goal during a NHL match.[5]