Joseph Sickles heard one case in 1976, and temporary arbitrators were used between Eischen and Das.
Seitz was fired after he ruled against owners in the Andy Messersmith-Dave McNally reserve clause case that led to free agency. Roberts was fired after deciding management colluded against free agents between the 1985 and 1986 seasons.
AP Pro Football Writer Barry Wilner and AP Sports Writer Mike Fitzpatrick contributed to this report.
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