The Smart Ring: From the 17th Century Wearable Abacus to Today - Interesting Engineering

It appears that wearable technology is not as new as we think. Chinese traders were using the smart ring as early as the 17th century in the form of

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From Abacus Rings to Biometric Shirts - Proto.io Blog

The Smart Ring: From the 17th Century Wearable Abacus to Today

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Are smart rings the future of wearable tech? » Gadget Flow