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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 5033967 | ADF wind correction simulator An aviation training aid to facilitate the learning of instrument flying techniques. Primarily designed for the application of wind drift problems associated with tracking a straight course over the ground which making an NDB (non-directional beacon) inst... | 07/23/1991 |
