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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 |
| 5086464 | Telephone headset for the hearing impaired An adjustable telephone headset for the hearing impaired comprising a left and a right ear piece, a speaker within each ear piece, an input device, such as a microphone or magnetic induction pickup within one of the ear pieces, and an amplifier connected ... | 02/04/1992 |
