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| Patents for John N. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 275,954 | Apr. 17, 1883 | J.N. Spencer | Lathe and sander | sanding machines | |
| 342,048 | May 18, 1886 | J.N. Spencer | Machine for Turning Axles | axle making machines | |