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Dan BrettaKillebrew played in the majors and the minors for 5 years before becoming a full time major leaguer. He was signed as a "Bonus Baby" in 1954 which by the rules he had to be added to the major league roster at some point during the season. While he wasn't ready for the majors at 17 years old they had to put him on the roster by rule. I'm assuming they had to do this every year he played in the organization since he played parts of every season up to 1959 when he became a full time major leaguer.