NFL mechanics over the past 100 years Sept 19, 2019 12:45:23 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by FredFan7 on Sept 19, 2019 12:45:23 GMT -5 It started with a crew of three in 1920:www.footballzebras.com/2019/09/nfl100-the-expansion-of-officiating-crews-followed-the-evolution-of-the-game/