![[Main Page]](/en/upload/wiki.png)
Main Page
Patent:GB529461
| Patent: | GB 529461 |
| Title: | Improvements in and relating to devices or apparatus for teaching mathematics |
| Date: | 01.06.1939 |
| Place: | Derby |
| Country: | Great Britain |
| Person: | Marjorie Annie Nightingale |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  GB529461 |
(There is currently no text in this page)