College baseball goes high-tech to send pitch calls to mound

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MLB approves use of electronic pitch calling - The Boston Globe

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NFHS approves use of coach-catcher communications devices for high school baseball - The Vicksburg Post

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Shohei Ohtani gets job done on the mound and at the plate to lead Japan into World Baseball Classic semifinals - The Boston Globe

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Rays tuned in to new electronic pitch-calling technology