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 148,115 pages of information and 233,653 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]

See Also


Sources of Information

  1. The Engineer 1917