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Horology O
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| O-Ring |
An rubber O-shaped ring, It is used to seal the gaps, e.g. the gap
between the watchcase and the case back. |
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| Oscillating System |
The oscillating system is formed by the hairspring and
the balance. Two vibrations of the balance create the ticking sound
of a mechanical watch, known as 1 oscillation. |
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| Overcoil Hairspring |
A hairspring where the final (or terminal) curve is
elevated above the plane of the rest of the spring. |
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