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Sign of times: MLB gives OK to electronic pitch calling
Sign of times: Major League Baseball gives OK to electronic pitch calling - oregonlive.com
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File:Coleco Head To Head Baseball, Model 2180, Made In Hong Kong, Circa 1982 (Electronic Handheld Game).jpg - Wikimedia Commons
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Handheld video game:Mattel Electronics Baseball - Mattel, Inc. — Google Arts & Culture
Vanderbilt used an electronic wristband system for calling pitches
