1. Respiratory protective devices: threads for facepieces. Specification for centre thread connection Part 2, (28th September 1990) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (10 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Respiratory protective devices: threads for facepieces. Specification for standard thread connection Part 1, (28th September 1990) 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) ↗