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MLB will use independent Atlantic League as testing ground for robot umpires, other aggressive rule changes
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MLB to stop testing robot umps in Atlantic League; automated ball-strike system appears headed for Triple-A
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Imperfections And All, Robo Umps Make Significant Impact — College Baseball, MLB Draft, Prospects - Baseball America
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MLB robot umpires, rule changes: Atlantic League still experimenting
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Breaking Down the Good, Bad and Ugly of New MLB, MiLB Rules for 2021 Season, News, Scores, Highlights, Stats, and Rumors
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MLB, Atlantic League team up for more experimental rules