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 149,267 pages of information and 234,239 images on early companies, their products and the people who designed and built them.

Harry Robert Mayes

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Harry Robert Mayes (1895-1970)

1950 Patent. 'Improvements in or relating to the crankcases of internal combustion engines of the type having horizontally opposed cylinders'[1]

1953 Patent. '734,359. Motor power plant; jet propulsion plant'[2]

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