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| Patents for I. P. Pirsson | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,620 | Jun. 06, 1848 | W.A. Cole | Circular plane | circular planes | |
| 10,720 | Apr. 04, 1854 | S. Andrews | Drop and die forging and punching machine | drop hammers | |
| 29,852 | Sep. 04, 1860 | I.S. Barber | Machine for turning ovals | wood lathes | |