Blip – 1977 Mechanical Pong [video]
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Electronic Pong games of the day cost 8X to 24X more. Crazy how that ratio has flipped, with electronics becoming cheaper and mechanics more expensive. I bet someone could recreate it with a 3D printer; a lot of it was plastic and the patent has some detailed diagrams of the gearing and cams: https://patents.google.com/patent/US4147350