Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,518 pages of information and 233,949 images on early companies, their products and the people who designed and built them.
of Ingrow, Near Keighley, Yorkshire.
1931 Nuernberg Schwachstrom Fabriken, a German manufacturing company, set up British NSF Co to import its products.
1932 Private company.
1932 A radio factory was established by British NSF at Croydon; 23 German technicians were brought in for 6 months to train the workers. British manufacture commenced making small components essential to aircraft production.
1934 The Home Secretary gave permission for women and young people to be employed on 2 day shifts in the Wire Winding Dept, at Croydon
WWII NSF was placed under the government’s Custodian of Enemy Property. In one air raid that around 30 employees were killed and several wounded. The Ministry of Aircraft Production relocated the factory to Keighley; the first premises were in Dalton Lane.
Postwar: the Company moved to their current premises at Ingrow Bridge. Began production of resistors, condensers and carbon potentiometers and some switches.
1946 Company made public.
1950 Started to manufacture the Ledex Rotary Solenoid under licence from Ledex Incorporated
1951 Name changed to NSF Ltd. Started production of rotary wafer switches.
1957 Part of Simms Motor and Electronics Corporation
1961 Manufacturers of switches and controls for the automobile, electronic and radio industries. 1,000 employees. 
1965 A minority of the shares was sold to the public. Had made its first contribution to Centralab Ltd, a 50:50 joint venture with a US company (Globe-Union Inc of Milwaukee), which would manufacture miniaturised circuits at a new factory being built at Antrim
1980 NSF included in Lucas Industrial Systems; NSF adopted the Lucas brand.
1996 Following the Lucas-Varity merger, there was a management buy-out of NSF
1997 NSF Controls was formed and re-established previous international manufacturing and distribution relationships.