151. Specification for reed contact units of assessed quality: generic data and methods of test. (16th August 1972) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (70 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
152. Specification for tractive armature direct current neutral track and line relays for railway signalling. (26th July 1950) 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) ↗
153. Specification for tractive armature direct current neutral-polar line relays for railway signalling. (14th July 1950) 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) ↗
154. Specification. Proximity switches for aircraft. Requirements for magnetic proximity switches incorporating Reed contact units Part 2, (1st April 1979) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (5 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗