Antenore Belletti was employed as foreman before and during the Second World War at the Società Italiana Ernesto Breda, after which he went on to work for Piero Magni Aviazione, where he specialized in manufacturing fuselages for military and commercial mid-weight aircraft.
He began working for himself in 1945, opening a small workshop in the Ortica district of Milan, where he mainly repaired American aircraft fuselages as well as built new ones for Milanese companies.
At the beginning of the 60s, Belletti moved his workshop into a larger space in Rodano, a town in the province of Milan and, thanks to a loan granted to him by Artigiancassa, invested in the purchase of a TIG welder, a welding technique still relatively unused in Italy in those years.
Thanks to the rapprochement of technicians Giuseppe Pattoni and Lino Tonti in the early 60s, Belletti began some fruitful collaborations with motorcycle companies.
In the motorcycle industry, Antenore Belletti primarily worked for brands such as Paton, Linto, Guazzoni, Puch Frigerio and Honda, building frames for Grand Prix motorcycles.