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1h 10min, jan 1, 1600 y - The Abacus Ring

Description:

The Abacus ring was a very early version of the calculator watch, dating back to the Qing Dynasty in China.

Added to timeline:

Innovations in Wearable Tech

ByNicholas Myers

14 Dec 2017

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Date:

1h 10min, jan 1, 1600 y

Now

~ 426 years ago

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