| Description | Letters Patent, dated 13th February 1937, issued to Cannon Iron Foundries Ltd. of Bilston, Staffordshire, Richard Talbot Clayton and Wilfred Eric Benton, for 'Improvements relating to thermostatic control valves on gas cookers'; copy of a United States Patent for a heat distributor plate, patent no. 539,042 belonging to Forest V. Detwiler of Chicago, Illinois; correspondence with Barker, Brettell & Duncan, Chartered Patent Agents, Birmingham. |