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In page Marv Hubbard:

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Multiple shoulder injuries sidelined him for part of 1975, and Hubbard spent all of the 1976 season on injured reserve. He received a Super Bowl ring for being a team member of the 1976 season Super Bowl Champion Oakland Raiders (January 1977 Super Bowl XI.) In 1977 he signed with the Detroit Lions, where he saw reduced play, and then retired. Hubbard also sustained, in the words of his wife, "more concussions than you could count" during his playing career.[7]