Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 146,105 pages of information and 231,598 images on early companies, their products and the people who designed and built them.
of Farnborough, Orpington, Kent.
Tranco valves, guides and springs.
1939 Private company.
1961 Manufacturers and repairers of valves, valve machinery, valve tools, jigs and piston rings. 
1963 Motor Show exhibitor. Engine valves.