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 133,439 pages of information and 211,690 images on early companies, their products and the people who designed and built them.

John Gray (1874-1935)

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John Gray (1874-1935), an Electrical engineer and director of BTH

1917 Patent department of BTH[1]

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Sources of Information

  1. The Engineer 1917