This 1920s Shockwatch Was Like a Taser For Your Wrist

While those of us here in the early 21st century argue over the future of smartwatches and smart rings , inventors of the 1920s would probably think we're all a bunch of babies. Sure, your Pebble might have caller ID. But can it incapacitate a potential mugger with a 10,000 volt high frequency shock? I didn't think so.
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