Robot umps: Bad umpiring overshadows World Series Game 5 - Sports Illustrated
What would a robot in an MLB umpire's uniform look like behind home plate? — Crowquill
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Sports Archives - Page 59 of 1276 - Hawaii Tribune-Herald
Sports Archives - Page 60 of 1276 - Hawaii Tribune-Herald
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Robot Umps Will be Calling Pitches at Future MLB Games
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Wallstreetjournal 20160401 The Wall Street Journal, PDF, Minimum Wage