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The late great Raiders quarterback Ken Stabler was introduced by his longtime coach John Madden in a pre-taped video. Madden is recovering from hip and open heart surgery.
The "Snake" was the league's MVP in 1974 and won a Super Bowl with the Raiders in 1977.
Former 49ers' owner Ed DeBartolo Jr. is also being inducted. Under his watch, San Francisco won five Super Bowls.