My grandparents had a Zenith console TV that had a remote control that used ultrasonic tuning forks. [0] The tuner had presets and some sort of stepper or solen

My grandparents had a Zenith console TV that had a remote control that used ultrasonic tuning forks. [0] The tuner had presets and some sort of stepper or solenoid driving it. Hit the channel up button, and CLACK! thump-thump-thump you'd go to your next preset. You could make the TV do random things by jingling keys or coins. [0] https://en.wikipedia.org/wiki/Robert_Adler#Contributions_to_the_remote_control https://en.wikipedia.org/wiki/Robert_Adler#Contributions_to_...