Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,180 pages of information and 233,418 images on early companies, their products and the people who designed and built them.
Part of Plessey Co
1974. Cheney Manor, Swindon, Wiltshire. Business general manager— G. Brookes. Integrated circuits for linear and digital applications—standard, custom and customer designed. 
1989 Retained its name even after the take-over of Plessey