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 148,109 pages of information and 233,634 images on early companies, their products and the people who designed and built them.

E. C. D.

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May 1943
June 1944.
November 1944.

Electro-Chemical Devices (E. C. D.) Ltd. of Tonbridge, Kent.

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