Fonds contains the technical and operational files relating to the Canadian Marconi Co./Canadian Overseas Telecommunications Corporation operation of the Yamachiche wireless receiving station in Yamachiche QC, 1913-1973. It includes correspondence 1925-1931, some operational files, technical files on wireless receivers at the station and blueprints of receiver schematics 1934-1952; manuals and instruction books for receivers made by Marconi’s Wireless Telegraph Co., Canadian Marconi Co., Hasler Ltd., Northern Electric Co., Philips Telecommunications etc., 1942-1964. Operational files from the Canadian Overseas Telecommunications Corp. which include its corporate memos and procedures and various types of weekly and monthly technical reports, 1955-1971. A selection of logs for telegraph, telephone and graphs for wireless circuits to major cities in Europe, Asia and South America, 1963-1973. Also trade literature and catalogues produced by Marconi’s Wireless Telegraph Co. Ltd. and other manufacturers, 1927-1963.