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1891 James Dickerson Humpidge in partnership with his brother, Mr. H. Theo. Humpidge and Mr. G. E. Snoxell acquired an engineering business at Dudbridge, near Stroud, forming Humpidge and Snoxell and began the manufacture of the "Dudbridge" gas-engine, as well as carrying out a general engineering trade.
1892 First gas engines produced ; production of an i/c engine under A. White, the chief engineer
1895 Engines marketed under the Dudbridge name
1899 further changes were made in the constitution of the firm - the steam-engine business was sold, and the works were devoted to the manufacture of gas and oil engines; the title of the Company was altered to the Dudbridge Iron Works.