Butterley Company correspondence file on wayleave agreements with railway companies for telephone and teleprinter lines between Codnor Park Offices and Ollerton Colliery Mostly correspondence on obtaining wayleave agreement, Aug 1935-June, 1936, including copy of agreement with London, Midland and Scottish and London North Eastern Railway Companies, 30 March 1936, with two internal letters on quality of telephone line, Sep 1944 Aug 1935-Sep 1944