1. Graphical symbols for electrical power, telecommunications and electronics diagrams. Telecommunications: switching and peripheral equipment Part 9, (28th June 1985) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (18 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Specification for telex terminal apparatus for connection to public telecommunications operators' telex networks. (30th November 1990) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (56 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗