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Patent:US1503299
| Patent: | US 1503299 |
| Title: | Calculator |
| Date: | 29.07.1924 |
| Place: | Carson, Iowa |
| Country: | USA |
| Person: | Glen L. Canon |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1503299 (espacenet), US1503299 (uspto) |
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