BALANCE SPRING AND METHOD FOR MANUFACTURING SAME
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United States of America Patent
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Dec 14, 2011
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Nov 25, 2011
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Abstract
The present invention relates to a balance spring intended to equip a balance of a mechanical timepiece, formed by a spiral bar resulting from machining a fused quartz plate, which has a positive thermal coefficient of rigidity, the bar constituting a core at least locally covered by at least one outer layer having a different structure to modify the thermal coefficient of rigidity.
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