21. Alarm systems. Alarm transmission systems and equipment. Requirements for Supervised Premises Transceiver (SPT) Part 2, (27th July 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (34 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
22. Alarm systems. Intrusion and hold-up systems. Power supplies Part 6, (24th June 2021) 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) ↗
23. Alternating current static watt-hour meters for active energy (classes 1 and 2). (9th August 2002) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (54 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
24. Aluminium and aluminium alloys. Wrought forging stock. Mechanical properties Part 2, (15th May 1997) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
25. Anaesthetic and respiratory equipment. Low-flow nasal cannulae for oxygen therapy. (31st August 2022) 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) ↗
26. Anaesthetic and respiratory equipment. Nebulizing systems and components. (19th September 2019) 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) ↗
27. Analogue PSTN terminal support interface. (15th October 1999) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (28 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
28. Anechoic chambers. Shield attenuation measurement Part 1, (15th January 1997) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (14 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
29. Apparatus for connection to private circuits run by certain public telecommunication operators. Specification for apparatus for connection to speechband circuits Part 1, (31st October 1985) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (46 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
30. Apparatus with one or more particular functions for connection to the British Telecommunications public switched telephone network. Apparatus with auto-calling, auto-answering and auto-clearing facilities. Specification for auto-calling facilities Part 3.1, (15th March 1985) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗