Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 146,883 pages of information and 232,667 images on early companies, their products and the people who designed and built them.
of Acton Hill Works, Acton.
of Junction Works, Hythe Road, Willesden Junction, London, N.W.10.
More commonly referred to as NEC or N.E.C.
Manufacturer of NEC Motors, N. E. C. automobiles, aero engines, marine engines, and later of machine tools.
1905 Early British make of automobile designed by George Frederick Mort
1905 November. Details of their cars.
1906. Produced a 24-30 h.p. four-cylinder horizontal engine car with shaft-drive. 
1907 November. Details of their 40-hp car.
1908 October. Detail of the springing of the cars.
1908 November. Details of the 40-hp car shown at Olympia.
1909 Introduced the first 'supercharged' aero engine. A sectioned example is (or was?) on display at the London Science Museum (see photo). It was a 2-stroke 50 HP engine designed by G. F. Mort, capable of running at 1500 rpm, a high speed for that time. The Roots-type blower had three chambers, the two end ones pumping air, while the centre chamber pumped a rich air-petrol mixture. A rotary valve (see photo) admitted the mixture after the air. The final mixture was compressed to 80 psi. The blower substituted for the more commonn system of crankcase compression used in 2-strokes, rather than boosting the inlet pressure. It is not clear why this lightweight, simple engine did not become more popular for aircraft.  
1913-1917 For a list of the models and prices see the 1917 Red Book
1919-21 30hp and 40hp model.
1922 Manufactured patent universal drilling tables, hand milling machines, general engineering, motorcar components
1938 The works were occupied by Norton and Gregory