Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,374 pages of information and 230,039 images on early companies, their products and the people who designed and built them.
of Exeter Airport, Devon.
1936 Private company formed.
1954-56 Harper was a scooter produced. A prototype was built with the intention of fitting a 122cc or 197cc Villiers three-speed engine with fan cooling and a starting motor. The glass-fibre body had a full fairing that carried twin headlights. Although development work continued for a couple of years, few machines were ever built.
1954 No dividend paid
1955 Resumed dividend payments
1956 The Harper Mk 1 was replaced by the Mk 4 in petrol and electric forms.
1957 Introduced the Harper Mk 6
1958 Design development and precision engineers, tool makers, maker of aircraft components and assemblies. Was part of Harper Group, of Hanover Sq, London
Introduced the Harpermatic version of the MK 6 with a CV transmission
1959 Name changed to Harper Engineering and Electronics
1960 The Harper Mk 6 was named the Stanley Mk 7.
1961 Manufacturers of aircraft components. 
1965 Production of invalid carriages ceased.