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Hi Leo, The light gun works similarly to the NES Zapper in that both used photosensitive detectors to translate light into electric current. When you pull the trigger, the photosensor recorded light levels from the screen (or from other light sources). The signal could be decoded in different ways depending on the pattern of light that the gun detected, which was then recorded on a magnetic disc. The light gun technique only works with cathode ray tube (CRT) screens, by the way, rather than with LCD or plasma screens. The U.S. patent number for Baer’s light gun is 3599221, which you can find on Google patent search. If you are curious about Baer’s early work on video games, check out his book ‘Videogames: In the Beginning’ by Rolenta Press (2005).