| Description | Letters to Cannon Iron Foundries Ltd. from Barker, Brettell & Duncan, Chartered Patent Agents, Birmingham, including: various letters about different patents and trademarks belonging to Cannon; a letter, dated 27th December 1927 stating that Mr W.O. Duncan had recently become a partner in the business; a letter, dated 29th December 1928, telling of the change of company offices in London. The firm was previously called George Barker and Brettell, and subsequently became Barker, Brettell & Duncan. |