1. Calculators and adding machines. Specification for keytop and printed or displayed symbols Part 3, (30th June 1982) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (4 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Specification for calculators and adding machines. Numeric section of ten-key keyboards for calculators and adding machines Part 1, (31st May 1977) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (3 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. Calculators and adding machines. Layout of function keys on adding machines Part 2, (31st May 1977) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (6 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
4. Calculators and adding machines. Glossary of terms for calculators Part 4, (29th November 1985) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (16 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗