The Sabres, along with the Vancouver Canucks, joined the NHL in the 1970–71 season. Their first owners were Seymour H. Knox III and Northrup Knox, scions of a family long prominent in Western New York and grandsons of the co-founders of the Woolworth's variety store chain; along with Robert O. Swados, a Buffalo attorney. On the team's inaugural board of directors were Robert E. Rich, Jr., later the owner of the Buffalo Bisons minor league baseball team; and George W. Strawbridge, Jr., an heir to the Campbell Soup Company fortune. Buffalo had a history of professional hockey; immediately prior to the Sabres' establishment, the Buffalo Bisons were a pillar of the American Hockey League (AHL), having existed since 1940 (and before that, another Bisons hockey team played from 1928 to 1936), winning the Calder Cup in their final season.