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Patent:US2774536
| Patent: | US 2774536 |
| Title: | Calculating machine |
| Date: | 18.12.1956 |
| Place: | Castro Valley |
| Country: | USA |
| Person: | Harold J. Chall |
| Company: | Friden (P) Calculating Machine Co., Inc. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2774536 (espacenet), US2774536 (uspto) |
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