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| Patents for Charles G. Keyes | |||||
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| Number | Date | Patentee | Title | Type | |
| D24,503 | Jul. 23, 1895 | L.S. Starrett | Try Square | squares | |
| 557,446 | Mar. 31, 1896 | L.S. Starrett | Speed Measure | measurement gauges | |
| 580,432 | Apr. 13, 1897 | L.S. Starrett | Speed Indicator | wheel-based measurers | |