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Patent:US2893631
| Patent: | US 2893631 |
| Title: | Power operated sign control mechanism |
| Date: | 07.07.1959 |
| Place: | San Francisco |
| Country: | USA |
| Person: | Nils H. Bergfelt |
| Company: | Friden (P) |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US2893631 (espacenet), US2893631 (uspto) |
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