| Description | Papers including: correspondence between Cannon and Barker, Brettell & Duncan, Chartered Patent Agents, Birmingham; provisional specification; Certificate of Patent for Improvements relating to plate shelves and racks for cookers; Letters Patent No. 562439 issued by Barker, Brettell & Duncan to Cannon Iron Foundries and Richard Talbot Clayton and Arthur Frederick Oatley; diagrams illustrating specification. |