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| Patents for Edward S. Duvall Jr. | |||||
| Number | Date | Patentee | Title | Type | |
| 498,726 | May 30, 1893 | C.W. Preston | Stock for Surface Gages or Other Implements | surface gauges | |
| 526,638 | Sep. 25, 1894 | B.R. Scott, C.H. Harvey, C.H. Scott | Bevel | bevels | |
| 577,904 | Mar. 02, 1897 | B.D. Whitney | Expansible reamer | ||