Marconi, Guglielmo, 1874-1937.
Guglielmo Marconi correspondence.
Includes business and technical correspondence.
Marconi Ltd. -- Records and correspondence.
Business -- Records and correspondence.
Telegraph, Wireless -- History.
AIP-ICOS
Marconi and GEC Archives. GEC Corporation, Marconi Place, Great Baddow near Chelmsford, England.