Well, I just found C2; it's a Gobron-Brilliè....so, hoping not to bark to the wrong tree, I suppose that B1 is a car built by Eugene Brilliè before he met Gobron to form the Gobron-Brilliè, and that A9 is an advice of the factory after 1918 when it become just Gobron. About the years I guess A9 1920-24, B1 1903-05, C2 1912.