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| Patents Granted on 1838-04-02 | |||||
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| Number | Date | Patentee | Title | Type | |
| 664 | Apr. 02, 1838 | R. Savary | Machine for Making Wrought Spikes and Nails | specialty woodworking machines | |
| 667 | Apr. 02, 1838 | O. Wright, A.A. Wright | Rotary steam-engine | rotary steam engines | |