Greubel Forsey is currently experimenting and testing two fundamental inventions in EXT; 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 5th 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.