File:Mattel Baseball, Model 2942-0320, Made in Hong Kong, Copyright 1978 (LED Handheld Electronic Game).jpg - Wikimedia Commons
MLB looking at electronic system for calling pitches | AP News
An Electronic Umpire? Baseball Tried It (In the 1950s!) - The New York Times
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File:Sears Offense-Defense Electronic Baseball, Model No. 49-65094, Made In Taiwan, Copyright 1980 (Electronic Handheld Game).jpg - Wikimedia Commons
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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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Sign of times: MLB gives OK to electronic pitch calling
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