Letters patent granted to Thomas Farmer for 'Improvements in treating Pyrites to obtain Sulphur, Sulphurous Acid and other products'
Address of Farmer given as Gunnersbury House near Acton, Middlesex. With separate English patent specification (i.e. no. 8398) dated 1840 Aug 25 (1 sheet, parchment). All housed in patent agent's box.
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