Balance spring intended to be clamped by a resilient washer
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United States of America Patent
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May 29, 2018
Issued Date -
N/A
app pub date -
Feb 25, 2015
filing date -
Mar 5, 2014
priority date (Note) -
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Abstract
A balance spring includes a strip wound around itself into several coils, the inner coil being integral with a collet including a band extending substantially in the form of a polygon. The outer contour on each bulging portion of the vertices of the polygon includes two axially extending walls substantially parallel to each other relative to the segment formed between the center of the collet and the end of the bulging portion.
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