1. Optics and optical instruments. Ophthalmic optics. Measuring system for spectacle frames. (28th February 1992) 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. Optics and optical instruments. Opthalmic optics. Marking of spectacle frames. (28th February 1992) 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) ↗