The Smart Ring: From the 17th Century Wearable Abacus to Today - Interesting Engineering
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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
PDF) Abacus Gestures: A Large Set of Math-Based Usable Finger
