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Цитата:
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Back to Glashütte, where the patent delivered to Richard Lange by the German Reich in 1931 was still displayed on a workshop wall a few years ago. Richard Lange died two years after earning the patent, which meant he was unable to fulfil his ambitions and nor indeed were his immediate successors. It was not until 10 years after the 1994 rebirth of Lange & Söhne that production of balance-springs finally began. As an established customer of Nivarox-FAR, the Saxon company equips only some of its models with its own spring: those fitted with a large free-sprung balance, in particular the Double Split and Datograph chronographs, as well as the Richard Lange tribute watch. Does the German company deliver its springs to other brands of the Richemont group? Yes, but only to Jaeger-LeCoultre, which was for years an especially close sister company, with IWC, under the leadership of Günter Blümlein.
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Отсюда:
Who else makes balance-springs?
