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Patent:US1811688
| Patent: | US 1811688 |
| Title: | Apparatus for use in the laying op antiaircraft guns |
| Date: | 23.06.1931 |
| Place: | Westminster |
| Country: | USA |
| Person: | Percy Willis Gray |
| Company: | Vickers (P) Ltd. |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US1811688 (espacenet), US1811688 (uspto) |
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