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... concepts: the balance and the spring.
In the 21st century.
The spring has been optimized to the limit, becoming an extremely fine spiral-shaped spring, 99.9% of which is used in mechanical watches.
It is about 3-4 times thinner than a human hair, with a total weight of about 2mg, yet it can withstand 600g of tension, with considerable toughness.
In timepieces, the inner end of the spring is fixed to the axis of the balance, and the outer end is fixed to the balanc ...
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