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MLB to test electronic device for catchers to give signals to pitchers - ESPN
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Sign stealing - Wikipedia
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A's impressions of PitchCom range from 'a little weird' to 'a lot of pluses
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Five things to ponder while the Rangers wait for a Corey Seager hamstring update
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MLB is turning to an electronic pitch-calling system to fight cheating
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A brief history of video and technology in baseball, and how it helped teams steal signs - The Boston Globe
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MLB will allow teams to use PitchCom, the anti-sign-stealing device, in 2022 season - The Athletic
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MLB Allow Using Of PitchCom System To Combat Sign Stealing
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Houston Astros manager, GM fired after suspensions for team's sign-stealing
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If MLB wants the Red Sox and other teams to stop stealing signs via video, there's an easy way to do it - The Boston Globe
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Rays tuned in to new electronic pitch-calling technology
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MLB To Test New Electronic Device For Pitchers/Catchers Signs in Minor Leagues
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MLB sign stealing: History of allegations before Astros, Red Sox scandal - Sports Illustrated