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NFL jersey numbers 2021: Live updates on 49ers number changes – NBC Sports Bay Area & California
NFL players wore the No. 0 for the first time in league history in Week 1 - Sports Illustrated
NFL jersey number restrictions could change for running backs, receivers, tight ends, linebackers, defensive backs
Picking a jersey has uniform appeal among 49ers' players and fans
New jersey numbers for players and other rule changes for 2021 - Hogs Haven
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NFL jersey numbers 2021: Live updates on 49ers number changes – NBC Sports Bay Area & California