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Patent:US2533569
| Patent: | US 2533569 |
| Title: | Calculator |
| Date: | 12.12.1950 |
| Place: | La Vega |
| Country: | USA |
| Person: | Jovino A. Espinola |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2533569 (espacenet), US2533569 (uspto) |
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