Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,106 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
Ducommun was a manufacturer in Mulhouse (now France, but annexed by Germany 1871-1918).
1868 Slotting machine by J. Ducommun et Cie described and illustrated in 'Engineering' 
A bevel gear shaping machine by Ducommun is on display at the Musée des Arts et Métiers in Paris.
Commercial vehicles with a shaft drive were built for about three years. Many of these were operated in London by the Rapid Transport Co during 1906, until they went out of business. They were then sold to Hastings but this lasted less than a year as that operator also went into liquidation.