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| Patents Granted on 1803-12-30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 511X | Dec. 30, 1803 | J. Selby | Improvement in Painting Rooms | painter | |
| 512X | Dec. 30, 1803 | F. Guy | Improvement in Making Colors for Painting, Printing, Etc. | painter | |