Relief pitching as a specialization has become increasingly refined in the past 50 years. Today we have closers, setup men, long relievers, middle relievers, loogies and possibly other sub-specialties.
However, in the live ball era since 1920, these are the only relief pitchers to accomplish two related feats.
What are those two related feats that no other relievers have accomplished since 1920?
Congratulations to John Autin and Brandon who jointly identified the feats that only these eight pitchers have accomplished since 1920. These are the only pitchers with seasons of 30 or more relief appearances and no starts that include one of more seasons averaging less than one inning per appearance and also one or more seasons averaging two or more innings per appearance.