Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 138,150 pages of information and 223,040 images on early companies, their products and the people who designed and built them.

Roke Manor Research

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1956 Founded as Plessey Research Roke Manor by the Plessey Co. The first managing director was Harold J. Finden, an electrical engineer. Initially staffed by 28 engineers, the company undertook research into military communications systems.

1990 Taken over by the joint venture GEC-Siemens.

1991 Became wholly owned by Siemens when GEC sold their 50% shareholding to Siemens Plessey Electronic Systems.

2010 Acquired by the Chemring Group

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