G. H. Dingwall and Son (Engineers)
of Derby Road, Dalston
1870 Company founded
1892 First hand-propelled invalid carriage
1922 First motorised tricycle introduced
1912-1949 Produced 3-wheelers later used as invalid carriages - mostly used 197cc Villiers engine
Dingwall produced hand-propelled and motorised tricycles for the Ministry of Health (others were Argson Engineering Co and R. A. Harding and later Invacar, Tippen, A.C. and George Fitt Motors.
1953 Production ceased
Later renamed as Harty Dingwall