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| Patents for Aaron T. Spence | |||||
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| Number | Date | Patentee | Title | Type | |
| 728,423 | May 19, 1903 | A.T. Spence, J.H. Prugh, S.B. Zimmer | Floor surfacer, cleaner, and polisher | sanding machines | |
| RE12,681 | Aug. 20, 1907 | A.T. Spence, S.B. Zimmer, J.H. Prugh | Floor surfacer, cleaner and polisher | sanding machines | |