Marchio con cui Francesco Vincenzo Lanfranchi produce biciclettte a motore nella sua officina di via De Filippi a Milano (vedi F.V.L.).
PS was a brand of motorcycle which Francesco Vincenzo Lanfranchi produced in his workshop in Via De Filippi in Milan. Lanfrachi of Florence was a fine rider famed for setting world speed records in France with Peugeot in 1903. See also F.V.L.
Sources: Moto di Lombardia
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