Greubel Forsey is currently experimenting and testing two fundamental inventions in EWT: the Binomial and the Différentiel d'Egalité.
The Binomial is a mono-material balance-and-spring system. The central idea behind this invention lies in associating the balance and spring with isochronically stable materials.
Greubel Forsey’s fifth fundamental invention is the Différentiel d'Egalité. This is a constant force device structured around the spherical differential that has its own reserve of energy supplying constant force to the oscillators.