Binomial à différentiel d'égalité

Greubel Forsey is currently experiment and test two fundamental inventions in EWT; the Binomial and the Différentiel d’Egalité.

The Binomial is a mono-material balance-and-spring mechanism. The central idea behind this invention lies in associating the balance and spring with isochronically stable materials.

Greubel Forsey’s 5^th fundamental invention, is the Différentiel d’Egalité . This is a constant force device structured around the spherical differential and which has its own reserve of energy that supplies a constant force to the oscillators.