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 142,918 pages of information and 228,821 images on early companies, their products and the people who designed and built them.

British Duplex Motor Engine Syndicate

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1909 December. Letter claiming the rights to the Kelly Duplex Engine and how that of J. H. Hopkins may infringe those rights.[1]

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