Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 162,253 pages of information and 244,496 images on early companies, their products and the people who designed and built them.
Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.
1877 Patent. '616. To Douglas Coates Crawford, of Chertsey, in the county of Surrey, Civil Engineer, for the invention of "improved means and apparatus for signalling on railways."[1]
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