This one is new to me, despite being a kid in the 1980s, the Armatron, a robotic arm from Radio Shack. Here are some videos I’ve had open in tabs for weeks now, so offloading here for safe-keeping:
Apparently despite having some minimal electronic parts, the device is mostly mechanical.
There was also a mobile version:
This video shows the guts of how the mechanism and gearbox work:
All in all, seems like a really cool toy! I wish I had one in good working order to experiment with as a drawing tool.
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