| Description | Letters patent no. 543,677, dated 2nd September 1940, issued to Cannon Iron Foundries Ltd. with Richard Talbot Clayton and Arthur Frederick Oatley for 'Burners and hot plates for gas fired cooking apparatus'; provisional and complete specification for the same patent; report written by Barker, Brettell & Duncan for Cannon Iron Foundries on the gas hot plate set forth in provisional application no. 13,710; correspondence with Barker, Brettell & Duncan, Chartered Patent Agents, Birmingham. |