Sourced production or model lifecycle range used by the main catalog timeline.
Brough2½ HP Motor Tricycle
Early Brough three-wheeler powered by a proprietary De Dion-Bouton engine. A belt drove the rear axle according to automobile-encyclopedia summaries, distinguishing it from a conventional motor bicycle with a single driven rear wheel. Accessible histories do not preserve seating capacity, exact steering arrangement, displacement, gearbox, brakes, price or whether more than one was completed. It is admitted as a qualifying motor tricycle without importing specifications from generic De Dion machines.
Dates with their meaning intact
This record contains useful sourced evidence, but it does not yet meet the reference-ready standard. Still needed: attributed imagery. Fields we cannot source stay empty rather than guessed.
Only a very small experimental or early-production quantity is evidenced; exact total unknown.