- 1Collection of Post Office Telegram and Telephone Papers (YA2005.92)
1900 - 1989, fonds - 2BT Connected Earth Collection (YA2003.22)
1894-1988, fonds - 3Collection of sales documentation and technical manuals relating to the BT Monarch Call Connect System digital PABX (private automatic branch exchange) (MS/2186)
fonds - 4Sales leaflet: ‘The Monarch 120 Call Connect System’ (MS/2186/1)
item - 5Technical manual for use by prospective purchasers: ‘The Monarch 120 Call Connect System, Technical Description Part 1’ (MS/2186/2)
file - 6Technical manual for use by prospective purchasers: ‘The Monarch 120 Call Connect System, Technical Description Part 2’ (MS/2186/3)
file - 7Technical manual: ‘Monarch 120 A, B and Compact Call Connect Systems, Man Machine Interface (MMI) Commands with Abbreviated Maintenance Information’ (MS/2186/4)
file - 8Technical Manual: ‘Monarch System User Guide’, Issue 1, for the Monarch Call Connect system (MS/2186/5)
file - 9Technical manual, ‘Monarch Field Manual for BT field engineers’, Issue 1 April 1996, for the BT Monarch Call Connect system (MS/2186/6)
file - 10Sales information for the Plessey CDSS1 (MS/2186/7)
file
