Dear James Cricket,
And others interested in local manifestations of the Great Exhibition:
Here at the Design History Research Centre we have the Official Catalogues
for the 1851 events. Class I seems to relate to Mining and Mineral
products - does that fit with what you know? I believe that if you send
me the exhibitor number I can probably work out the company name.
Hope this helps,
Dr Lesley Whitworth
University of Brighton
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