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Patent:US2984411
| Patent: | US 2984411 |
| Title: | Key Responsive Multiplying and Printing Calculator |
| Date: | 16.05.1961 |
| Place: | |
| Country: | USA |
| Person: | Tingley |
| Company: | Sperry Rand (P) |
| Internal Links: | many patent numbers referenced in first paragraph |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2984411 (espacenet), US2984411 (uspto) |
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