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| Patents for Charles L. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 74,466 | Feb. 11, 1868 | W.E. Whiting | Improvement in Gauges for Augers | drill depth stops | |
| 82,514 | Sep. 29, 1868 | T. Goodrum | Improvement in Calipers | calipers | |