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| Patents for William C. Espey | |||||
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| Number | Date | Patentee | Title | Type | |
| 498,726 | May 30, 1893 | C.W. Preston | Stock for Surface Gages or Other Implements | surface gauges | |
| 504,278 | Aug. 29, 1893 | C.W. Preston | Combination Gage | surface gauges | |