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| Patents Granted on 1855-04-17 | |||||
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| Number | Date | Patentee | Title | Type | |
| 12,715 | Apr. 17, 1855 | A. Drake | Explosive Gas Engine | gas and gasoline engines | |
| 12,723 | Apr. 17, 1855 | D. Fowler | Machine for Punching Metal | stamping presses | |
| 12,742 | Apr. 17, 1855 | C.A. Noyes | Slide Rest for Lathes | metal lathes | |
| 12,747 | Apr. 17, 1855 | C. Van Horn | Slide Rest for Lathes | metal lathe accessories and attachments | |
| 12,753 | Apr. 17, 1855 | J.D. Bradley, R. Porter | Elastic-tube pump | hand pumps | |