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

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

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