Catalogue of the Marconi Archives, encompassing archives of Marconi's Wireless Telegraph Company Ltd., the Marconi International Marine Communication Company Ltd., the English Electric Company Ltd., the Metropolitan-Vickers Electrical Company Ltd., the British Thomson-Houston Company Ltd., Associated Electrical Industries Ltd., the General Electric Company plc and other associated companies; together with personal papers of Guglielmo Marconi (1874-1937), electrical engineer, and Hugo Hirst…