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 134,583 pages of information and 213,686 images on early companies, their products and the people who designed and built them.

Greenwood and Hughes

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September 1950. Grevak Traps.
June 1951. Grevak Traps.

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Sources of Information