![](https://coimages.sciencemuseumgroup.org.uk/19/146/large_thumbnail_1861_0026_0002__0001_.jpg)
Technical manual: Monarch 120 Call Connect System / Maintenance Handbook
![Technical manual: Monarch 120 Call Connect System / Maintenance](https://coimages.sciencemuseumgroup.org.uk/245/734/small_thumbnail_2015_0499__0002_.jpg)
![Technical manual: Monarch 120 Call Connect System / Maintenance](https://coimages.sciencemuseumgroup.org.uk/245/733/small_thumbnail_2015_0499__0001_.jpg)
Technical manual: Monarch 120 Call Connect System / Maintenance Handbook
Details
- Category:
- Archive
- Object Number:
- 2015-499
- Materials:
- paper (fibre product), metal plated (unknown) and plastic (unidentified)
- type:
- document
- credit:
- BT Heritage and Archives