A Brief History of the Italian Marque
Considered the first Italian motorcycle, this machine was built in Padua by Professor Enrico Bernardi Zeno. It was a four-stroke engine on a trailer attached to a conventional bicycle, known as a Rimorchietto .
There is a Bernardi Motor Attachment of 1893 pictured at Murray Barnard's site.
N.B. There is another Bernardi produced much later: Bernardi
Sources: MC Storico Conti, et al.