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gptkb:World_Hockey_Association
|
no reserve clause
|
|
gptkb:World_Boxing_Council_(WBC)
|
introduction of mandatory challenger system
|
|
gptkb:World_Boxing_Council_(WBC)
|
introduction of anti-doping programs
|
|
gptkb:World_Hockey_Association
|
allowed players under 20
|
|
gptkb:1974_NFL_season
|
introduction of overtime in regular season
|
|
gptkb:World_Boxing_Council_(WBC)
|
introduction of instant replay in boxing
|
|
gptkb:1974_NFL_season
|
goal posts moved to back of end zone
|
|
gptkb:World_Boxing_Council_(WBC)
|
reduction of championship bouts from 15 to 12 rounds
|