Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,394 pages of information and 247,064 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.
1894 Patent by James Thompson Marshall and Reginald Wigram of Steam Plough Works, Leeds, on "Improvements in Steam Engine Valves and Gear for Working them"
1900 Patent by James Thompson Marshall and Reginald Wigram of Steam Plough Works, Leeds on "Improvements in Valve Gears for Steam Engines."
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