Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 145,350 pages of information and 230,731 images on early companies, their products and the people who designed and built them.
According to recent historical studies, the Italian inventors Eugenio Barsanti and Felice Matteucci patented a first working efficient version of an internal combustion engine in 1854 in London (pt. Num. 1072). It is claimed that the Otto engine is in many parts at least inspired from this precedent invention, but, as yet there is no documentation of knowledge about the Italian engine by Otto.