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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 |
| 5524663 | Vacuum tube shut-off for power tools The present invention provides a vacuum tube shut-off 10 for shutting off vacuum air flow between coating removal power tools 36 and a vacuum source 34. The vacuum tube shut-off 10 includes a vacuum tube 12 in vacuum air flow communication with the power ... | 06/11/1996 |
